SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Heavy-Ion Collisions and QCD Phases III

HK 17.7: Talk

Wednesday, September 1, 2021, 18:15–18:30, H1

Relativistic heavy-ion collisions and multiharmonic/large-order flow cumulants — •Seyed Farid Taghavi — Physics department, Technical University of Munich, James-Franck-Straße 1, 85748 Garching bei München

In the past years, significant progress has happened in high-energy nuclear physics models. A more robust and quantitative picture has replaced the qualitative descriptions of heavy nuclei collisions in the earlier days, enabling us to have a clearer picture of different stages of a heavy-ion collision. These models typically have O(10) free parameters. The free parameters are tuned by Bayesian analysis in recent years, where the ALICE measurements are used as inputs.

In this presentation, our focus is on anisotropic flow observables. We introduce a method to extract anisotropic flow cumulants systematically. Employing a Monte Carlo simulation tuned by Bayesian analysis results, we predict the value of few low-order flow harmonic cumulants with significant signals that have not been reported by the LHC so far. We address how the new observables can modify the Bayesian analysis results. The large-order flow cumulant (v_n{2k} with large k) contains a unique piece of information about the underlying flow distribution. In particular, we discuss the relation between the nonvanishing Lee-Yang zero phase and large-order flow cumulant ratios at ultra-central, ultra-peripheral, large, and small collision systems.
Based on:
S. F. Taghavi, (2020), arXiv:2005.04742 [nucl-th] (will be appeared in Eur.Phys.J.C)