Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √s.sub.NN./sub. = 27 and 54.4 GeV at RHIC

0577588 - ÚJF 2024 RIV NL eng J - Článek v odborném periodiku
Abdulhamid, M. I. - Aboona, B. E. - Adam, J. - Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Češka, J. - Das, A. - Holub, L. - Chaloupka, P. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Lomnický, O. - Prozorova, V. - Robotková, Monika - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. … celkem 366 autorů
Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √s_NN = 27 and 54.4 GeV at RHIC.
Physics Letters. B. Roč. 844, SEP (2023), č. článku 138071. ISSN 0370-2693. E-ISSN 1873-2445
Výzkumná infrastruktura: BNL-CZ III - 90234
Institucionální podpora: RVO:61389005
Klíčová slova: STAR collaboration * Heavy-flavor decay electron * Elliptic flow * Charm quark spatial diffusion coefficient
Obor OECD: Nuclear physics
Impakt faktor: 4.3, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1016/j.physletb.2023.138071

We report on new measurements of elliptic flow (v(2)) of electrons from heavy-flavor hadron decays at mid-rapidity (|y| < 0.8) in Au+Au collisions at vs(NN) = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at vs(NN) = 54.4 GeV exhibit a non-zero v(2) in the transverse momentum (p(T)) region of p(T) < 2 GeV/c with the magnitude comparable to that at vs(NN) = 200 GeV. The measured e(HF) v(2) at 54.4 GeV is also consistent with the expectation of their parent charm hadron v(2) following number-of-constituent-quark scaling as other light and strange flavor hadrons at this energy. These suggest that charm quarks gain significant collectivity through the evolution of the QCD medium and may reach local thermal equilibrium in Au+Au collisions at vs(NN) = 54.4 GeV. The measured e(HF) v(2) in Au+Au collisions at vs(NN) = 27 GeV is consistent with zero within large uncertainties. The energy dependence of v(2) for different flavor particles (p, f, D-0/e(HF)) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.
Trvalý link: https://hdl.handle.net/11104/0346725