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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 energies — Klaus Reygers¹, Alexander Schmah¹, •Anastasia Berdnikova², and Xu Sun³ — ¹Physikalisches 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(p_T) for an elliptic freeze-out surface is used which follows from the Cooper-Frye ansatz without further assumptions. Over the full available p_T 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.