Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F23%3A00577588" target="_blank" >RIV/61389005:_____/23:00577588 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.physletb.2023.138071" target="_blank" >https://doi.org/10.1016/j.physletb.2023.138071</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2023.138071" target="_blank" >10.1016/j.physletb.2023.138071</a>

Result language
angličtina
Original language name
Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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