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14/06/2022, 08:15
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Alexander Lenz (Siegen University), Blazenka Melic, Danny van Dyk (TU München)14/06/2022, 08:50
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Prof. Joaquim Matias (Universitat Autonoma de Barcelona and IFAE)14/06/2022, 09:00
In this talk I will present the most updated status of the global fits to all b->sll data. An anatomy of the main observables involved will be discussed together with their theoretical aspects. The most relevant scenarios of New Physics will be presented showing the degeneracy we observe systematically in all these years. I will present a full understanding of the reason of this degeneracy of...
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Méril Reboud (TUM)14/06/2022, 09:30
We parametrize nonlocal contributions in $b\to s\ell\ell$ transitions using a $z$-expansion fitted on theory inputs steaming from a light-cone operator product expansion and experimental measurements. This approach allows us to update the Standard Model predictions of experimental observables in the $B\to K\ell\ell$, $B \to K^*\ell\ell$ and $B_s\to\phi\ell\ell$, with a unprecedented control on...
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Oliver Witzel (Universität Siegen)14/06/2022, 10:00
Exclusive semileptonic $B_{(s)}$ decays are theoretically described by scalar and vector form factors. Combining experimental branching fraction measurements with theoretical form factor predictions, the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ can be extracted. In addition $R$-ratios testing lepton flavor universality can be derived to directly compare standard model predictions to...
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Ilja Doršner (University of Split)14/06/2022, 11:30
I will introduce two novel mechanisms to produce pairs of leptoquarks at Large Hadron Collider and present several case studies to discuss the associated phenomenological implications.
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Marco Fedele (KIT)14/06/2022, 12:00
In this talk I will review how the anomalous magnetic moment of the muon and the B anomalies can be addressed by a combined explaination, by means of loop models characterized by minimal field content. Moreover, I will show how some of these model can also provide a viable DM candidate, accounting for the measured relic density while evading direct and indirect DM constraints.
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William Parrott (University of Glasgow)14/06/2022, 15:00
We present HPQCD's improved scalar, vector and tensor form factors for $B \to K$ decay using the Highly Improved Staggered Quark formalism for more accurate normalisation of the weak currents and working on very fine lattices to cover the full physical $q^2$ range. Our uncertainties at $q^2=0$ are a factor of three better than earlier work.
We compare Standard Model observables using our...
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Luka Santelj14/06/2022, 15:30
Decays of B mesons that proceed through electroweak and radiative penguin amplitudes attract significant attention due to a number of observed discrepancies between the standard-model predictions and the results. Belle II is expected to perform measurements on channels closely related to those exhibiting anomalies and that are uniquely available to Belle II. These include b -> s(d) nu nubar...
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Gustavo Branco14/06/2022, 16:00
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Marcel Wald (University of Siegen)14/06/2022, 17:00
The recently developed $B$-mesogenesis scenario predicts the decays of $B$ mesons into a baryon and a hypothetical dark antibaryon in the final state. In this work, we suggest to apply QCD light-cone sum rules to estimate the partial width of the simplest exclusive decay mode $B^+\to p \Psi$, where $\Psi$ is a dark antibaryon. We consider two sample models of $B$-mesogenesis and identify the...
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Johannes Albrecht (TU Dortmund), Johannes Albrecht (TU Dortmund)14/06/2022, 17:30
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Jernej F. Kamenik (Jozef Stefan Institute and University of Ljubljana), Jernej Kamenik (Jozef Stefan Institute and Ljubljana University)14/06/2022, 18:00
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Christoph Schwanda (HEPHY Vienna)15/06/2022, 09:00
The rate of semitauonic B decays has been consistently above theory expectations since these decays were first measured. Recently significant differences between the forward-backward asymmetry in B -> Denu and B -> Dmunu were also reported. Belle II data are well suited to probe these anomalies. The low-background collision environment along with the possibility of partially or fully...
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20. NLO QCD corrections to inclusive $b \rightarrow c \ell \bar{\nu}$ decay spectrum up to $1/m_b^3$Dr Daniel Moreno (Siegen University)15/06/2022, 09:30
We present analytical results for higher order corrections to the decay spectrum of inclusive semileptonic heavy hadron weak decays using the heavy quark expansion (HQE). We describe the analytical computation of the spectrum of the leptonic invariant mass for $B \rightarrow X_c \ell \bar{\nu}$ up to terms of order $1/m_b^3$ within the HQE at next-to-leading order (NLO) in $\alpha_s$. The full...
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Paolo Gambino15/06/2022, 10:00
I will describe the first results of a new method to compute inclusive semileptonic decays on the lattice and the future perspectives.
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Nico Gubernari (technische universität münchen)15/06/2022, 11:30
QCD light-cone sum rules (LCSRs) are a method to calculate the relevant hadronic matrix elements in exclusive $b$-quark decays. I focus on the LCSRs with $B$ or $\Lambda_b$ distribution amplitudes. The versatility of this method allows to apply it to a wide variety of decays, especially to those where lattice QCD calculations are not available yet.
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In this spirit, I present a first... -
Philip Lüghausen (TUM)15/06/2022, 12:00
Processes involving the $B$-meson require non-perturbative input due to the nature of the strong interaction;
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one kind of input are the light-cone distribution amplitudes (LCDAs).
For the first time, we constructed a systematic parametrisation for the leading-power LCDA.
I present the construction itself as well as some demonstrations at the hand of common models and finally a... -
Luka Leskovec (Jozef Stefan Institute)15/06/2022, 15:00
The CKM matrix element $V_{ub}$ is both the smallest and least known of all CKM matrix elements; its current value has been determined in many ways, but directly primarily through the exclusive process $B\to\pi\ell\nu$. In this talk, we will present our progress towards a lattice QCD determination of the $V_{ub}$ matrix element from a novel transition - $B\to \rho \ell \nu$. On this ensemble,...
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Andreas Juettner15/06/2022, 15:30
In this talk I will discuss the analysis of lattice form-factor data for the exclusive decay of heavy-light mesons containing a bottom quark. Using simulation data from the RBC/UKQCD collaboration for $B_s\to K$, $B\to\pi$ and $B_s\to D_s$. I will address a number of questions arising and ideas for how to improve the analysis.
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Marvin Zanke (HISKP, University of Bonn)15/06/2022, 17:00
We discuss the Lorentz decomposition of $B \to \gamma^*$ matrix elements in terms of hadronic form factors, which are needed for a theory description of $B^- \to \ell^- \bar{\nu}_\ell \ell' \bar{\ell'}$ decays.
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Our approach closely follows the Bardeen–Tung–Tarach procedure and ensures freedom from kinematic singularities, which is needed to apply dispersion relations in the photon momentum.... -
Christopher Sachrajda (University of Southampton)15/06/2022, 17:30
Lattice QCD computations of a number of physical quantities, including leptonic decay rates, yield sufficiently precise results that electromagnetic corrections need to be implemented to make further progress in determining the parameters of the Standard Model and checking consistency with the corresponding experimental results. After a brief introduction to the framework, I will present the...
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Vladyslav Shtabovenko (KIT)15/06/2022, 18:00
In this talk I will report on the calculation of NNLO QCD corrections to the
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flavor observables in the mixing of neutral $B$ mesons and discuss their
numerical impact. The physical relevance of this work stems from the fact
that experimental measurements of e.g. the flavor mixing parameter
$\Delta \Gamma_{12}^s$ have already achieved per cent level accuracy,
while theoretical predictions... -
15/06/2022, 20:00
Restaurant Jadera
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Aleksey Rusov (University of Siegen)16/06/2022, 09:00
Motivated by recent indications that the rates of colour-allowed non-leptonic channels are in tension with their Standard Model predictions based on QCD factorisation, we investigate the potential to study CP asymmetries with these decays. In the Standard Model, these flavour-specific decays are sensitive to CP violation in $B^0_{(s)}$--$\bar{B}^0_{(s)}$ mixing, which is predicted with low...
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Philipp Böer (JGU Mainz)16/06/2022, 09:30
Flavour physics is a precision laboratory for tests of the Standard Model. Although most of the theoretical work is devoted to the understanding of hadronic effects, QED corrections will become increasingly important when higher experimental precision is reached. Traditionally, QED effects in exclusive $B$ decays are computed under the assumption that mesons are pointlike up to small distances...
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Gael Finauri (TUM)16/06/2022, 10:00
Two-body non-leptonic $B$ decays with heavy-light final states, like $B_s \to D \pi$ and $B \to D K$, are among the theoretically cleanest non-leptonic decays as penguin loops do not contribute. They can be described using QCD factorization which relies on the heavy quark expansion. Advancing the theoretical calculations of such decays requires also a careful analysis of QED effects. In this...
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Maria Laura Piscopo (University of Siegen)16/06/2022, 11:30
I will present a comprehensive analysis of inclusive decay widths of charmed mesons within the framework of the HQE. The theoretical predictions for D-mesons lifetimes and their ratios are found to be in agreement with the current experimental data, albeit with very large uncertainties. Open questions and potential theoretical improvements will also be discussed.
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James Gratrex (Rudjer Boskovic Institute)16/06/2022, 12:00
I present updated predictions for inclusive charmed hadron lifetimes, focusing particularly on the baryons. These predictions are compatible with recent LHCb measurements, which measured the lifetime of $\Omega_c^0$ to be four times greater than earlier results. I will also discuss areas for potential improvement of the predictions, which will be much-needed in order to compete with...
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Benjamin Grinstein (UCSD)17/06/2022, 09:00
The Standard Model decay rate of the $B_c$ meson is discussed together with a novel approach based on the usage of experimental data in combination with an operator product expansion. In the new method differences of $B$, $D$ and $B_c$ meson widths are considered, for which the free-quark contributions drop out, possibly leading to a reduction of the uncertainty of the theoretical prediction.
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M. Rebelo17/06/2022, 09:30
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Prof. Ulrich Nierste17/06/2022, 10:00
I discuss the recently finished calculation of the next-to-next-to-leading order corrections to the CP asymmetry in flavour-specific $B_{d,s}$ decays and the phenomenological studies
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which will be possible with better data. -
Alessandro Barone (University of Southampton)17/06/2022, 11:30
We address the non-perturbative calculation of the decay rate of the inclusive semi-leptonic B(s) mesons decay from lattice QCD. Precise theoretical Standard Model predictions are key ingredients in searches for new physics. This type of computation may eventually provide new insight into the long-standing tension between the inclusive and exclusive determination of the $V_{cb}$ and $V_{ub}$...
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Matthew Black (University Siegen)17/06/2022, 12:00
We present the status of ongoing work to extract pseudoscalar and vector decay constants for $B^{(*)}$, $B_s^{(*)}$ and $B_c^{(*)}$ mesons and determine phenomenologically interesting ratios such as $f_{B_s}/f_B$ or $f_{B^*}/f_B$. Our results extrapolated to physical quark masses and the continuum are compared to predictions by other lattice collaborations and QCD sum rules, and are used to...
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J Tobias Tsang (CP3-Origins, The University of Southern Denmark)17/06/2022, 15:00
The combination of the experimentally measurable mass differences between the flavour eigenstates of neutral mesons and theoretical predictions of the corresponding hadronic matrix elements provide direct access to the CKM matrix elements $V_{td}$ and $V_{ts}$. Furthermore, the full dimension-6 operator basis provides valuable constraints for New Physics models. I will present the status of...
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Thomas Mannel (University of Siegen)17/06/2022, 15:30
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Descotes-Genon17/06/2022, 17:00
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Maria Smizanska17/06/2022, 17:30
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Mikhail Shifman17/06/2022, 18:00
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17/06/2022, 19:30
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Manuel Szewc (Jozef Stefan Institute and ICAS-UNSAM)
In this talk we present a new method to measure the ratio of the top-quark branching fractions, which expands upon a previous CMS analysis. We incorporate an additional orthogonal light-quark-tagger and extend the statistical model implemented by the CMS collaboration to include the number of quark-tagged jets. We show that the interplay between these different orthogonal jet-taggers increases...
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Christoph Schwanda (HEPHY Vienna)
Precision determinations of $|V_{ub}|$ and $|V_{cb}|$ play a central role in precision tests of the CKM sector of the Standard Model and complement direct measurements of CP violation of B meson decays. In this talk, we present first results for $|V_{ub}|$ and $|V_{cb}|$ using collision events recorded at the $\Upsilon(4S)$ resonance by the Belle II experiment. We review the status of...
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