Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Heavy-Ion Collisions and QCD Phases XIV
HK 66.3: Vortrag
Donnerstag, 31. März 2022, 16:30–16:45, HK-H2
Multi-particle correlation in proton-proton collisions from a toy hydrodynamic model — •Seyed Farid Taghavi — E62, Physics department, Technical university of Munich, Garching, Germany
Over the past years, there have been ongoing debates on the origin of the long-range correlations observed in proton-proton collisions at RHIC and LHC. In this talk, a toy model based on Gubser flow is introduced to shed light on the applicability of hydrodynamics in proton-proton collisions. The model, initial state fluctuation + Gubser solution + Cooper-Frye freeze-out, is validated by comparing its results with MC-Glauber + VISH2+1. A rather model-independent approach for the initial state is followed where the RMS radius and ellipticity event-by-event fluctuations are modeled instead of modeling the initial entropy density of individual events. This approach helps us to find out which initial state fluctuating properties would lead to a correct final multiparticle correlation. The toy model describes the multiplicity and transverse momentum dependence of two-point and four-point correlation functions in an accurate agreement with proton-proton collision experimental measurements. In particular, the sign of the four-point correlation function is the same as the observation. We find that neither AMPT nor TRENTo with nucleonic substructure initial state models can produce the predicted fluctuation for the RMS radius and ellipticity.
Based on:
S. F. Taghavi, Phys.Rev.C 104 (2021) 5, 054906