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Methods of Effective Field Theory and Lattice Field Theory

→ Europe/Berlin
Benasque Science Center Av. Francia 17 Benasque - 22440, Huesca (Spain)
Alexei Bazavov (Michigan State University), Nora Brambilla (Physik Department, TU Munich), Sipaz Sharma (TUM), Viljami Leino (TUM), Johannes Heinrich Weber (Technische Universität München)
Description

 

The scope of this school is to offer graduate students and postdocs complementary training at the frontier of EFTs and lattice field theory focusing on relevant physical problems.

Besides introductory lectures to well-established and general methods in EFT and Lattice we will host talks on innovative ideas and approaches at the fields’ interface.

Special emphasis is put on aspects of nuclear physics relevant for neutrino and dark matter physics, jet physics, parton distribution functions and nuclear structure, vacuum and in-medium heavy quark physics, and quantum information science.

This training at the interface of these two approaches will provide young scientists with the tools for tackling the most interesting and still open problems in particle and nuclear physics.

Exercises, solutions as well as discussions will be key features of the school. Lecturers are supposed to assign few interesting and pedagogical exercises that will be solved in the afternoon and poster sessions will offer opportunities for presenting and discussing the participants’ research.

Webpage of the school

Link to Slack channel: https://join.slack.com/t/methodsofefta-c3n4269/shared_invite/zt-393nmraiu-TBERtUyZbSFx8GexPlP8dg

Venue information about the Benasque science center

Previous editions of the school 2023, 2021 and 2017

 

 

 

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  • Mon, September 15
    • Registration
    • Lectures: Introduction to Effective Field Theory (Antonio Pich)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Introduction to Lattice Field Theory (Anna Hasenfratz)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Lectures: Introduction to Effective Field Theory (Antonio Pich)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Dinner: Welcome Buffet
  • Tue, September 16
    • Lectures: Introduction to Lattice Field Theory (Anna Hasenfratz)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Introduction to Effective Field Theory (Antonio Pich)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Lectures: Gradient flow (Stefan Sint)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Wed, September 17
    • Lectures: Gradient flow (Stefan Sint)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Lattice fermions for light or heavy quarks (Johannes H Weber)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Thu, September 18
    • Lectures: Chiral perturbation theory (Jambul Gegelia)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Non-relativistic EFT (Nora Brambilla)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Coffee
    • Tutorials: Flash talks block 1
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
      • 1
        Kaon leptonic and semileptonic decays with N_f=2+1+1 HISQ fermions

        Current precision tests of the Standard Model show a deficit in the first row unitarity of the CKM matrix. At the current level of precision, the only relevant CKM matrix elements that contribute to first row unitarity are $|V_{ud}|$ and $|V_{us}|$. Without resorting on nuclear inputs, those can be extracted from the experimental decay width of kaon and pion leptonic decays along with the theoretical calculation of their decay constants, and semileptonic kaon decays along with the corresponding form factor at zero momentum transfer. In this talk we will discuss progress towards a correlated analysis of the lattice inputs needed for this test using highly improved staggered quarks (HISQ) on the MILC $N_f=2+1+1$ configurations.

        Speaker: Ramón Merino (Universidad de Granada)
        ramonslides.pdf
      • 2
        Electromagnetic Form Factor of the Pion using Feynman-Hellmann

        As the simplest bound state of QCD, the pion provides valuable insight into the non-perturbative nature of the strong force. The pion’s electromagnetic structure, probed via elastic scattering, is encoded in the pion form factor $F_π (Q^2 )$. At low momentum transfers, $F_π (Q^2)$ is well described by the Vector Meson Dominance (VMD) model, while at high momentum transfers it can be understood using perturbative QCD. Determining its behavior across this range provides insight into the transition between the non-perturbative and perturbative regimes, which has been debated since the early days of QCD.
        We evaluate $F_π (Q^2 )$ using the numerical approach of lattice QCD together with the Feynman-Hellmann technique to simplify calculations. Accessing larger momentum transfers requires the evaluation of highly boosted pions, which are notoriously noisy. To overcome this, we utilize two noise reduction techniques: All-Mode Averaging (AMA), which increases the effective statistics without an associated increase in computational cost, and Momentum Smearing (MS), which improves the overlap with boosted states. Both methods improve the signal quality, and together these techniques extend our LQCD calculations to higher $Q^2$ than previously.

        Speaker: Jordan Mckee
        Pion Form Factor.pptx
      • 3
        Exploring New Physics in transition $b\to s\,\ell^+\ell^-$ through different $B_c\to D_s^{(\ast)} \,\ell^+\ell^-$ observables

        We probe new physics (NP) in the flavor-changing neutral-current transition $b\to s\ell^+\ell^-$ using the channel $B_c\to D_s^{(*)}\ell^+\ell^-$ with $\ell=\mu,\tau$. Using a helicity-amplitude formulation within the effective-theory framework, we include vector/axial-vector NP operators and compute key observables: the branching ratio, the longitudinal helicity fraction $f_L$, the lepton forward--backward asymmetry $A_{FB}$, and lepton-flavor-universality (LFU) ratios $R_{D_s^{(*)}}^{\tau\mu}$.

        We test scenarios with universal NP couplings (common to $\mu,\tau$) and non-universal ones (muon-specific), constrained by the latest global fits to $b\to s\ell^+\ell^-$ data, and provide SM vs NP predictions across low/high $q^2$ bins.

        Our results show these observables are simultaneously sensitive to NP and discriminating among competing scenarios.
        These results can be tested at the LHCb, HL-LHC, and FCC-ee, and therefore, precise measurements of these observables not only deepen our understanding of the $b\to s\ell^+\ell^-$ process but also provide a window of opportunity to possibly study various NP scenarios.

        Speaker: Qazi Maaz Us Salam
        Benasque_presentation.pdf
      • 4
        On finite volume effects of spectral densities from euclidean correlators

        Spectral densities play a key role in particle physics, as they connect correlation functions computed in quantum field theory to real-time observables measured in experiments, such as cross sections and decay rates. In strongly-interacting theories, their non-perturbative extraction from lattice simulations entails the inverse Laplace transform. Using recent developments based on the Mellin transform and starting from the analytic expression for the leading finite-volume effects of the two-point function of the electromagnetic current, we present preliminary results on the associated finite-volume systematics in the corresponding spectral density.

        Speaker: Francesca Argia Bresciani (Università degli Studi di Milano-Bicocca)
        Presentation_Benasque.pdf
      • 5
        Two-pion scattering amplitude from Lattice QCD using staggered fermions

        Scattering processes featuring the strong interactions can be studied using lattice QCD through the so-called Lüscher formalism. This formalism uses analyticity and unitarity of the S-matrix to relate infinite-volume scattering amplitudes to finite-volume energy levels, which are computed from Euclidean lattice correlation functions. On the one hand, lattice QCD calculations commonly employ the so-called rooted staggered fermions, due to their lower computational cost. On the other hand, these fermions violate unitarity and manifest a more intricate spectrum compared to other fermion discretizations. In this talk, we will briefly discuss possible approaches to addressing the challenges of the staggered theory in the Lüscher formalism for calculating two-pion scattering amplitudes.

        Speaker: Dr Adeilton Dean Marques Valois (University of Granada)
        flash_talk_benasque_dean.pdf
      • 6
        Wick's contractions and correlators for up to four hadrons on a time slice

        We present results from a Python implementation that computes Wick contractions for up to four hadrons on a single time slice and across up to four time slices (sink, source, and two currents). The algorithm systematically simplifies the contractions, yielding a significant reduction in the number of diagrams. We then connect these diagrams to physical correlators by identifying the relevant spin combinations and structure coefficients, and by performing the tensor contractions of perambulators with the corresponding mode doublets and/or triplets using PyTorch.

        Speaker: Dr Herzallah Alharazin (Ruhr Universität Bochum)
        Presentation-Herzallah.pdf
      • 7
        Computing the Muon g−2 Hadronic Light-by-Light Contribution with Dynamical QCD+QED and C-star Boundary Conditions

        The anomalous magnetic moment of the muon ($g-2$) offers one of the most precise and sensitive probes of the Standard Model (SM). The persistent discrepancy between experiment and SM predictions suggests potential new physics. Among the hadronic contributions, the hadronic light-by-light (HLbL) scattering term remains one of the leading sources of theoretical uncertainty in the SM prediction, motivating the development of alternative, systematically improvable lattice approaches. This project aims to compute the HLbL contribution using a fully non-perturbative lattice QCD+QED framework, based on the subtraction method. This approach is expected to mitigate some of the key challenges faced by previous methods, such as poor signal-to-noise ratios, by reformulating the problem to avoid direct computation of four-point correlation functions. Moreover, the use of C$^\star$ boundary conditions, as implemented in the OpenQ$\star$D codebase, can potentially offer better control over finite-volume effects and incorporates dynamical QCD+QED consistently. By bridging exploratory studies and production-level calculations, this project aims to provide an independent and systematically controlled determination of the HLbL contribution to the muon $g-2$.

        Speaker: Khai Phan (ETH Zurich)
        RCstar meeting (18.09).pptx
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Fri, September 19
    • Lectures: Chiral perturbation theory (Jambul Gegelia)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lectures: Introduction to Lattice Field Theory (Anna Hasenfratz)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Non-relativistic EFT (Nora Brambilla)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Mon, September 22
    • Lectures: Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Hadron spectroscopy & scattering (John Bulava)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Tue, September 23
    • Lectures: Partons & EFT (Xiangdong Ji)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials: Flash talks block 2
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
      • 8
        Hadronic Matrix Elements of the QCD EMT via Gradient Flow: GFFs, Trace Anomaly, and Mass Decomposition with a Demonstration in Charmonia

        We compute the matrix elements of the QCD energy-momentum tensor via the gradient flow method and match the flowed composite operators to the $\overline{\rm MS}$ scheme at 2 GeV using two-loop perturbative renormalization. This framework enables a nonperturbative and renormalized determination of quark and gluon contributions to hadron structure from lattice QCD. We apply this methodology to charmonium states, including the pseudoscalar $\eta_c$ and the vector $J/\psi$, using ensembles at three lattice spacings $a=0.04,0.05,0.06$ fm to control discretization effects. After performing a continuum extrapolation based on these ensembles, we carry out an extrapolation to vanishing flow time to remove flow-time artifacts. This two-step procedure ensures a controlled matching to continuum QCD observables. We report precise determinations of the partonic decomposition of the $\eta_c$ and $J/\psi$ GFFs, masses, including their trace anomaly contributions, providing new insight into the internal structure of charmonium.

        Speaker: Mr Ran Luo (Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China)
        RanLuo_Benasque.pdf
      • 9
        What can Floquet theory teach us about lattice fermions?

        Lattice field theory and Floquet theory have traditionally been considered two distinct subjects: The former deals with quantum field theories in equilibrium on discrete spacetime, while the latter describes periodically driven non-equilibrium systems in continuous time. Recently, however, it has been shown there may be a deep connection between these two areas, stemming from a spectral equivalence between a naively time-discretized Dirac fermion and a particular class of Floquet systems. I will discuss these new developments, including recent work that extends this equivalence to the level of correlation functions and interactions in the infrared limit. This correspondence opens the possibility of simulating Dirac fermions with a Floquet drive. It also raises interesting questions about the extent to which the exotic features arising from time discretization can be reproduced in Floquet systems.

        Speaker: Will Gyory (Iowa State University)
        Floquet_Talk_Benasque.pdf
      • 10
        NREFT, Lattice and Form Factors

        In this talk, I briefly discuss the NREFT formalism and its application to extracting form factors of unstable particles on the lattice.

        Speaker: Ajay Shanmuga Sakthivasan (HISKP, University of Bonn)
        FlashTalk-Sakthivasan.pdf
      • 11
        Heavy Tetraquark Hadron Spectroscopy using lattice QCD

        We present our recent investigation on doubly bottom and bottom-strange
        tetraquarks in the isoscalar channel in search of a possible tetraquark
        bound state. The calculations are performed on four ensembles with
        dynamical quark fields up to the charm quark generated by the MILC
        Collaboration with various lattice spacings. Multiple volumes have been
        used to account for finite volume effects. Overlap action has been used
        to calculate light and strange quark propagators. Finite volume energy
        has been calculated using the variational method followed by rigorous
        scattering amplitude analysis calculation $\it{à ~la}$ Lüscher. We find
        strong evidence for a deeply bound state in the doubly bottom tetraquark
        channel, but no conclusive evidence for the existence of a
        bottom–strange tetraquark.

        Speaker: Bhabani Sankar Tripathy (The Institute of Mathematical Sciences, Chennai)
        benasque_bhabani.pdf
      • 12
        Light Nuclei Spectroscopy from Lattice QCD

        Understanding the structure and interactions of nuclei directly from Quantum Chromodynamics (QCD) remains a central goal in theoretical nuclear physics. Lattice QCD provides a first-principles framework for such studies, but multi-baryon calculations are hindered by two major challenges: the exponential degradation of the signal-to-noise ratio and the factorial growth of Wick contractions with increasing nucleon number. In this work, we present an optimised determinant method that reformulates multi-baryon contractions to achieve polynomial scaling in the number of quarks, while systematically eliminating redundant determinant evaluations through randomized algorithms. We further demonstrate a GPU-accelerated CUDA implementation, delivering at least two orders of magnitudes speedups over serial CPU calculations, and explore a complementary TensorFlow-based approach for rapid prototyping in light nuclear systems. Preliminary spectroscopy results for two-, three-, and four-nucleon systems at multiple pion masses are reported, along with possible binding energy determinations and comparisons to earlier lattice QCD and phenomenological model results.

        Speaker: Debsubhra Chakraborty (Tata Institute for Fundamental Research, Mumbai)
        D Chakraborty_Benasque2025.pdf
      • 13
        On-shell effective field theory and quantum transport for hard photons

        I will present the formulation and discuss applications of the on-shell effective field theory (OSEFT) for photons, recently formulated to describe high-energy electromagnetic modes beyond the classical eikonal approximation. Derived from the Maxwell Lagrangian, the OSEFT for photons describes nearly on-shell modes via a systematic expansion in inverse powers of the photon energy. The formulation of the OSEFT requires a careful treatment of the physical (transverse) and non-physical (scalar and longitudinal) degrees of freedom of the gauge field. The non-physical degrees of freedom can be eliminated by integrating out and using local field redefinitions, without the need for gauge-fixing.
        The final OSEFT Lagrangian can be formulated in terms of only one vector field, which is invariant under gauge transformations that are respectful with the energy scale separation assumed. The OSEFT for photons is also consistent with the Lorentz symmetry, which is made manifest through the reparametrization invariance (RI) of the theory.

        Building on applications, I will show that including interactions with fermion fields, the OSEFT can be used in quantum field theory perturbative computations. In particular, at finite temperature or chemical potential.

        I will also elaborate on how to use the OSEFT framework to derive quantum kinetic equations for photons, using the Schwinger-Keldysh formalism. The OSEFT also provides a systematic way to derive quantum corrections to the classical photon Wigner function. Finally, I will provide a first principles derivation of the side-jump effect, by exploiting the RI of the OSEFT. The side-jump on the photon Wigner function affects the Lorentz transformation properties of the so called Stokes parameters, necessitating a revised definition to ensure their covariance.

        Speaker: Marc Comadran (Universitat de Barcelona (UB))
        Flash_talk_BENASQUE-1.pdf
      • 14
        Fractional isntantons and confinement on T_2XR^2

        Here we present a study on Yang-Mills theories on a T_2xR^2 torus equipped with twisted boundary conditions. We study the system as a function of the size of the T_2 torus. At small size, a semi-classical approximation in terms of fractional instantons is expected to hold. We identify these objects using the gradient flow and we relate their density with the topological charge and the string tension. We use the lattice to interpolate the results at small size to the large volume case.

        Speaker: Ivan Soler (University of Pisa)
        Benasque2025_Ivan.pdf
      • 15
        Effects of Heavy Quark Energy Loss and Coalescence on the Suppression and Flow of Heavy Quark Hadrons and Jets

        In order to model heavy quarks traversing the quark gluon plasma created in heavy ion collisions, several physical effects must be taken into account. After heavy quarks are created in hard scatterings at $t=0$ in heavy ion collisions at RHIC and the LHC, they traverse the strongly coupled QGP medium, losing energy to it, undergo Brownian-like motion due to the thermal properties of the medium and finally hadronize with either particles from the medium, or other hard partons from hard scatterings. We introduce heavy quarks in the Hybrid Model, and implement each of these three effects. To model strongly coupled energy loss of a heavy quark that starts out ultrarelativistic, loses energy, slows down, becomes non-relativistic at later times, and ultimately comes to rest we turn to AdS/CFT. To date, holographic calculations have provided separate descriptions for the rates of energy loss $dE/dx$ either for ultrarelativistic massless quarks and gluons or for infinitely massive quarks in strongly coupled plasma, with the latter calculation valid for $\sqrt{\gamma}<M/(\sqrt{\lambda}T)$, where $\gamma$ is the Lorentz boost factor for a heavy quark with velocity $v$ and mass $M$ moving through strongly coupled plasma with 't Hooft coupling $\lambda$ and temperature $T$. We provide an ansatz for uniquely incorporating both regimes to give a unified but approximate description of how a heavy quark that is initially ultrarelativistic loses energy all the way until it comes to rest. We also implement Gaussian momentum broadening to model the Brownian motion of the quark, ensuring that the heavy quarks can thermalize at late times. To model the hadronization of heavy quarks that hadronize by combining with soft medium partons we implement a local color neutralization model for recombination, and to model the hadronization of heavy quarks that hadronize with other hard shower partons we implement Lund string hadronization using PYTHIA. We introduce criteria for deciding which heavy quarks to hadronize in each way. We confront our predictions for the suppression $R_{AA}$ and azimuthal anisotropies $v_2$ of B- and D-mesons and $\Lambda_c$ baryons, $R_{AA}$ of B-tagged jets, as well as baryon-to-meson ratios, with available experimental data from ALICE, ATLAS and CMS.

        Speaker: Jean Du Plessis (Massachusetts Institute of Technology)
        BenasqueFlash2025.pdf
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Wed, September 24
    • Lectures: Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Flavor physics (Alejandro Vaquero)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Poster session
  • Thu, September 25
    • Lectures: Spectral reconstruction (William Jay)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Finite temperature field theory continuum (Jacopo Ghiglieri)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lectures: Finite temperature field theory lattice (Christian Schmidt)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials: Flash talks block 3
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
      • 16
        Phase transition of QCD matter under anisotropic conditions

        We investigate the influence of momentum-space anisotropy on the QCD phase diagram using the Polyakov chiral SU(3) quark mean field (PCQMF) model. Momentum anisotropy, characteristic of the quark-gluon plasma, is introduced through a small spheroidal deformation in the particle momentum distribution, quantified by a parameter $\xi$. Our analysis focuses on the resulting changes to the phase boundary and the displacement of the critical end point (CEP). We find that even a weak anisotropy causes a significant shift in the CEP's location in the temperature-baryon chemical potential plane. This underscores the importance of including momentum anisotropy for a realistic determination of the QCD phase diagram's features.

        Speaker: Dhananjay Singh (Dr. B. R. Ambedkar National Institute of Technology Jalandhar)
      • 17
        Search for the QCD critical endpoint via Lee Yang Zeros

        In this flash talk, a method to estimate the location of the QCD critical endpoint is presented. The approach is based on modeling the free energy as a rational function of the baryon chemical potential $\mu_B$ and extracting the corresponding Lee-Yang edge singularities. High-statistics simulations with 4HEX-improved staggered fermions on $16^3 \times 8$ lattices, performed by the Wuppertal-Budapest Collaboration, are employed to determine the position of the nearest singularity in the QCD phase diagram.
        Theoretical background and key results are briefly summarized.

        Speaker: Alexander Adam (University of Wuppertal)
        Benasque25_Adam.pdf
      • 18
        Open beauty mesons at non-zero temperature from Lattice QCD

        Understanding how heavy-light mesons behave in hot QCD matter is essential for
        interpreting results from heavy-ion collision experiments and studying the properties of
        the Quark-Gluon Plasma (QGP). We present results from the FASTSUM collaboration
        for temperature dependence of the B-meson spectrum from dynamical Lattice QCD.
        We use relativistic light quarks and we simulate the b quarks with a non-relativistic
        effective theory (NRQCD) on anisotropic lattices. These results represent the first high-
        temperature lattice study of the B-meson spectrum.

        Speaker: Rachel Horohan D'Arcy (Maynooth University)
        RHD_FlashTalk.pdf
      • 19
        Non-perturbative behavior of thermal QCD up to the electroweak scale: lessons from screening masses

        It has recently become possible to study thermal QCD at temperatures up to
        the electroweak scale $T\sim 160\ \mathrm{GeV}$ with non-perturbative lattice
        simulations. Among the quantities that are being investigated in this regime,
        screening masses offer crucial insight about e.g. spatial correlations in the
        quark-gluon plasma, how close it is to being a plasma of free partons,
        and the restoration of chiral symmetry.
        In this flash talk I will present recently published and preliminary results for
        screening masses of baryons and mesons, both in the static and non-static
        Mastubara sectors, and point out how the comparison with complementary
        perturbative computations in the high-temperature effective field theory
        approach highlights important non-perturbative contributions even at such high temperatures.
        The companion poster will contain more technical details on the non-perturbative
        lattice strategy and the perturbative computations in EFT.

        Speaker: Pietro Rescigno (University of Milano-Bicocca, INFN Milano-Bicocca)
        slides_benasque25_rescigno.pdf
      • 20
        Improving quark matter bulk viscosity estimates - towards NLO in the dominant weak reaction rate

        Gravitational waves from neutron star mergers provide a powerful probe of ultra-dense QCD matter. A key input for reliable merger simulations is the bulk viscosity, which governs the damping of density oscillations. However, theoretical predictions remain uncertain, particularly since the dominant weak process u+s↔u+d has so far only been treated at tree level, neglecting potentially sizable higher-order QCD corrections.

        In this work, we take the first steps toward a fully controlled next-to-leading-order (NLO) perturbative QCD calculation of this reaction rate. We identify the key challenges that obstruct NLO treatments in the standard Boltzmann framework. To overcome these, we derive a general NLO starting point from the Kadanoff–Baym equations, within the framework of non-equilibrium quantum field theory. This yields a systematically improvable approach for computing non-leptonic weak reaction rates beyond leading order.

        Our approach will enable improved estimates of bulk viscosity, and the resulting improvements will directly impact merger-simulation fidelity and the extraction of QCD-matter properties from gravitational-wave data.

        Speaker: Hanna Lempiäinen (University of Helsinki)
        FlashTalk_Lempiainen.pdf
      • 21
        Results for the EoS at finite B and muB from the lattice

        We present results for the equation of state in a hot and dense lattice setup under the influence of an external magnetic field, reflecting the physics relevant to heavy-ion collisions. Results are shown from an analytic continuation, as well as from an alternative expansion scheme that projects the known expansion from scenarios without magnetic fields onto the case where an external magnetic field is present.

        Speaker: Marc-André Petri (Bergische Universität Wuppertal)
        Benasque25_Petri.pdf
      • 22
        Baryon Electric Charge Correlation as a Magnetometer of QCD

        We present the first lattice QCD results of quadratic fluctuations and correlations of conserved charges in (2+1)-flavor lattice QCD in the presence of a background magnetic field. The simulations were performed using the Highly Improved Staggered Quarks with physical pion mass $m_\pi$ = 135 MeV on $N_\tau=8$ and 12 lattices. We find that the correlation between net baryon number and electric charge, denoted as $\chi^{\rm BQ}_{11} $, can serve as a magnetometer of QCD. At pseudocritical temperatures the $\chi^{\rm BQ}_{11}$ starts to increase rapidly with magnetic field strength $eB $>$ 2M^2_{\pi}$ and by a factor 2 at $eB\simeq 8 M^2_{\pi}$.

        By comparing with the hadron resonance gas model, we find that the $eB$ dependence of $\chi^{\rm BQ}_{11}$ is mainly due to the doubly charged $\Delta$(1232) baryon. Although the doubly charged $\Delta$(1232) could not be detected experimentally, the proxy constructed from its decay products, protons and pions, retain the $eB$ dependence of $\Delta$(1232)’s contribution to $\chi^{\rm BQ}_{11}$. Additionally, under the same kinematic cuts as in the ALICE experiment, the proxy for $\chi^{\rm BQ}_{11}$ still exhibits a strong dependence on the magnetic field.

        Speaker: Jin-Biao Gu (Central China Normal University)
        EFT2025slides_jbgu.pdf
      • 23
        QCD phase boundary from strangeness fluctuations on a high statistics lattice data set

        We investigate the QCD transition line at baryon chemical potentials up to $500$ MeV using the strangeness fluctuations as a proxy. The high statistics simulations on a $16^3 \times 8$ lattice with 4HEX improved action allow for a Taylor expansion of the fluctuations up to eighth order in the baryochemical potential. We plot the contours of strangeness susceptibilities and look for the convergence of the contours as a possible hint for the existence of a critical point.

        Speaker: Piyush Kumar (Bergische Universität Wuppertal)
        benasque_talk_final_pk.pdf
    • Coffee
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
  • Fri, September 26
    • Lectures: Finite temperature field theory continuum (Jacopo Ghiglieri)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Lectures: Finite temperature field theory lattice (Christian Schmidt)
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Lunch
    • Tutorials
      Algorithms in continuum perturbation theory (Vladyslav Shtabovenko)
      Born-Oppenheimer EFT for XYZ states (Nora Brambilla)
      Chiral perturbation theory (Jambul Gegelia)
      Factorial growth of perturbation theory & EFT (Andreas Kronfeld)
      Finite temperature field theory continuum (Jacopo Ghiglieri)
      Finite temperature field theory lattice (Christian Schmidt)
      Flavor physics (Alejandro Vaquero)
      Gradient flow (Stefan Sint)
      Introduction to EFT (Antonio Pich)
      Introduction to LFT (Anna Hasenfratz)
      Neutrino-Nucleus Interactions (Andre Walker-Loud)
      Partons & EFT (Xiangdong Ji)
      Spectral reconstruction (William Jay)
      Spectroscopy and Scattering Amplitudes in Lattice QCD (John Bulava)
    • Coffee
    • Poster prizes and closing ceremony
      poster_closing_benasque.pdf
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