Abstract
In these proceedings, we present the measurements of nuclear modification factors for electrons from open charm (c→e) and bottom hadron decays (b→e) at mid-rapidity region in Au+Au collisions at √SNN = 200 GeV. The significance of the difference in nuclear modification factors between b→e and c→e is ≥ 3σ. We also present the measurements of the elliptic flow (v2) of inclusive heavy-flavor hadron decayed electrons (HFE) in Au+Au collisions at √SNN = 27 and 54.4 GeV. The results show non-zero HFE v2 in 54.4 GeV Au+Au collisions and a hint of smaller HFE v2 in 27 GeV Au+Au collisions than those at 54.4 and 200 GeV.
Highlights
Heavy quarks are predominantly produced at the early stages of the relativistic heavy-ion collisions before the creation of the deconfined Quantum Chromodynamics medium, known as the Quark-Gluon Plasma (QGP)
Studies of the production of electrons from open charm and bottom hadron decays in Au+Au collisions serve as a valuable tool to investigate the mass hierarchy of the parton energy loss
There is a hint of smaller HFE v2 in 27 GeV Au+Au collisions compared to those at 54.4 and 200 GeV and those of light flavor mesons in 27 GeV Au+Au collisions
Summary
Heavy quarks are predominantly produced at the early stages of the relativistic heavy-ion collisions before the creation of the deconfined Quantum Chromodynamics medium, known as the Quark-Gluon Plasma (QGP). They subsequently traverse the created system throughout its evolution, and measurements of heavy-flavor hadron production and elliptic flow (v2) are unique and indispensable probes of the QGP properties. Middle: the fraction of b→e as a function of pT in 0-80% Au+Au collisions, along with that in p+p collisions and the FONLL prediction. Right: the fraction of b→e as a function of pT in different centralities of Au+Au collisions, along with that in p+p collisions and the FONLL prediction. SQM 2021 v2 of heavy flavor hadrons and their decay daughters at different collision energies provide important insights into the temperature dependence of the heavy-flavor quark interactions wealsietcwhtretolhlnesasQfroGinmPc.louIpsnievntehcehhseaearvmpyr-oaflncaedvebodorinttegolsem,ctwhroaednrpo(rHnesFdeEenc)tapvy2rseiilnnim√√inssaNNrNNy==re2s02u07ltGsaneodVn the production of Au+Au collisions, 54.4 GeV Au+Au collisions
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