Overview talk on femtoscopy in heavy ions
Dummy abstract
In a thermal system, fluctuations of particle yields are directly encoded in the equation of state of the system under the study. By measuring event-by-event fluctuations over an ensemble of events via cumulants or moments of particle multiplicity distributions, one can study the freeze-out conditions in heavy-ion collisions and clarify their relation to the QCD phase transition.
In this...
Femtoscopy is a method relating particle correlations to their emission source and interaction potential. Applying this technique to a small collision system, such as pp, has the advantage of probing the inner part of the interaction potential. In order to allow for an accurate determination of the correlation function for small sources, we have developed a new C++ analysis tool called...
In hydrodynamical modeling of heavy-ion collisions, the equation of state (EoS) is usually taken to be lattice QCD EoS. However, the still often used parametrisation for lattice QCD EoS, s95p, is strictly speaking not compatible with the contemporary lattice QCD results. We have devised a new family of EoS parametrisations based on hotQCD and Budapest-Wuppertal data, and different lists of...
Symmetric cumulants, the novel flow observables which quantify the correlations between event-by-event fluctuations of two different flow harmonics, have been utilized extensively by the experimentalists in recent flow analyses in ultra-relativistic nuclear collisions, both at RHIC and LHC.
These observables provide the strong constraints for the details of QGP's temperature dependence of...
We show that far-from-equilibrium relativistic fluid dynamics may be systematically defined, for arbitrary flow profiles, in terms of a generalized tensorial expansion with transport coefficients that contain an all order resummation in gradients. In this formulation, the transport coefficients of far-from-equilibrium fluid dynamics depend not only on the microscopic properties of the system...
I present the state-of-the-art of anisotropic flow fluctuations in heavy-ion collisions. Event-by-event fluctuations of flow coefficients are investigated experimentally by means of multi-particle cumulants, which are indicators of the non-Gaussian behavior of the $v_n$ distributions. After a brief review of the theoretical basis underlying cumulants and the related observables, I use selected...
There is now a wealth of experimental data from RHIC and the LHC in small collision systems ranging from p+p, p+A, d+Au, 3He+Au that should help for constraining the underlying physics mechanisms at play. We detail a number of the key observables (https://arxiv.org/abs/1801.03477) and give a critical assessment of various theoretical interpretations. We attempt to provide a map forward in...
We will report on recent developments of charmonium production within the statistical hadronisation model. Charmonium production as a function of centrality, rapidity and transverse momentum will be presented and compared to available LHC data. The model can be extended to all charmed mesons and baryons. Predictions for the transverse momentum spectra of exotic charmonium states are made for...
I will discuss recent lattice QCD results on equation of state, transition temperature, fluctuations of conserved charges and color screening at vanishing and non-zero baryon density. I will show new results on the equation of state in 2+1 flavor QCD up to temperature 2000 MeV and recent results from Taylor expansion in baryon chemical potential for equation of state and the transition...
We investigate the suppression of ϒ mesons in the hot quark–gluon plasma (QGP) created in Pb+Pb collisions at energies available at the CERN Large Hadron Collider using a centrality- and transverse-momentum-dependent model that encompasses screening, collisional damping, and gluodissociation in the QGP. For ϒ(1S), the model prediction is compatible with experimental data from the CMS...
The science mission of the sPHENIX experiment, outlined in the 2015 US Nuclear Physics long range plan, calls for studies of the microscopic structure of the QGP through state-of-the-art jet, upsilon and heavy flavor measurements at RHIC, complementing similar measurements at LHC. We will discuss highlights of the proposed sPHENIX science program and describe the design and construction status...
Recent years have seen significant theoretical progress in the transport description of open heavy quarks in QCD matter - a number of models are now able to simultaneously describe a subset of the most important heavy flavor observables - a simultaneous description of a comprehensive set of observables at all available collision energies still poses a challenge. A global analysis encompassing...
Overview talk on open heavy flavour production in heavy ions
We study the propagation of charm and bottom quarks in the quark-gluon plasma (QGP) by means of a relativistic Boltzmann transport approach. The non-perturbative interaction of heavy quarks is described by means of a quasi-particle approach that entails only a weak dependence of the drag on the temperature. This features, along with hadronization by coalescence, plays a fundamental role to...
I will present our newly developed DREENA framework, which allows predicting energy loss of high pt partons traversing quark gluon plasma (QGP). The framework is based on dynamical energy loss formalism, and is applied to both the medium with constant temperature (DREENA-C) and to evolving medium modeled by Bjorken 1+1D expansion (DREENA-B). The formalism allows to generate predictions for...
This contribution will focus on the latest heavy-flavour correlation and jet measurements with the ALICE detector in pp, p--Pb and Pb--Pb collisions at the LHC.
In particular, the results of azimuthal correlations of D mesons with charged particles in pp collisions at $\sqrt{s}=$ 7 and 13 TeV and in p--Pb collisions at $\sqrt{s_{\rm NN}}=$ 5.02 TeV will be presented. Measurements of...
Overview talk on small systems
ATLAS has performed comprehensive measurement of two-particle and multi-particle long-range azimuthal correlations in pp, p+Pb and peripheral Pb+Pb collisions at various energies. This talk provides a comprehensive review of results from these measurements, and it discusses their implications for understanding the mechanism and time scale for the generation of the long-range correlations in...
I'd like to have 5 minutes to discuss two slides with hydrodynamic freeze-out surfaces for various "small" collision systems that may help to explain the absence (so far) of jet quenching effects in p-Pb and p-p collisions.
Both collision geometry and event-by-event fluctuations are encoded in the experimentally observed flow harmonic distribution $p(v_n)$ and 2k-particle cumulants $c_n\{2k\}$. In the present talk, we systematically connect these observables to each other by employing Gram-Charlier A series. Also we quantify the deviation of the flow harmonic distribution from Bessel-Gaussianity in terms of the...
The observation of a finite global polarization in agreement with
theoretical predictions has opened a new dimension in relativistic
heavy ion physics as well as in relativistic hydrodynamics, with
several intriguing connections to chiral and electromagnetic effects.
Very recent experimental observations seem to challenge the
hydrodynamic predictions. In this talk, the status of the theory...
