Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Heavy-Ion Collisions and QCD Phases I

HK 4.5: Vortrag

Montag, 30. März 2020, 17:45–18:00, J-HS F

Blast-wave description of Upsilon elliptic flow at LHC energiesKlaus Reygers1, Alexander Schmah1, •Anastasia Berdnikova2, and Xu Sun31Physikalisches Institut, Ruprecht-Karls-Universit at Heidelberg, Heidelberg, Germany — 2National Research Nuclear University MEPhI, Moscow, Russian Federation — 3Georgia State University, Atlanta, Georgia 30303, USA

A simultaneous blast-wave fit to particle yields and elliptic flow (v2) measured as a function of transverse momentum in Pb–Pb collisions at LHC energies is presented. A compact formula for the calculation of v2(pT) for an elliptic freeze-out surface is used which follows from the Cooper-Frye ansatz without further assumptions. Over the full available pT range, the Υ elliptic flow data is described by the prediction based on the fit to lighter particles. This prediction shows that, due to the large Υ mass, a sizable elliptic flow is only expected at transverse momenta above 10 GeV/c.

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