Physics PAN Seminar by Prof. Chun Shen (Wayne State University)

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Date: December 11, 2020
Time: 3:30 p.m. - 4:30 p.m.
Location: zoom
Category: Seminar

Physics PAN Seminar by Prof. Chun Shen (Wayne State University)

Title: Observable signatures of initial state momentum anisotropies in nuclear collisions

Abstract: We show that the correlation between the elliptic momentum anisotropy, v2, and the average transverse momentum, [pT ], at fixed multiplicity in nuclear collisions carries information on the origin of the observed momentum anisotropy. We develop the hybrid IP-Glasma+Music+UrQMD model that includes contributions from final state response to the initial geometry as well as initial state momentum anisotropies of the Color Glass Condensate. This model predicts a characteristic sign change of the correlator ρ_2(v2, [pT ]) as a function of charged particle multiplicity in p+Au and d+Au collisions at s = 200 GeV, and p+Pb collisions at s = 5.02 TeV. This sign change is absent in calculations without initial state momentum anisotropies. The model further predicts a qualitative difference between the centrality dependence of ρ_2(v2,[pT]) in Au+Au collisions at s = 200GeV and Pb+Pb collisions at s = 5.02TeV, with only the latter showing a sign change in peripheral events. Experimental observation of these distinct qualitative features of ρ_2(v2, [pT ]) in small and large systems would constitute strong evidence for the presence and importance of initial state momentum anisotropies predicted by the Color Glass Condensate effective theory.

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