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

The STAR collaboration

doi:10.1016/j.physletb.2023.138071

Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at s_{_NN} = 27 and 54.4 GeV at RHIC

The STAR collaboration

Chemistry

American University in Cairo
Texas A&M University
Czech Technical University in Prague
AGH University of Krakow
Ohio State University
Panjab University
Variable Energy Cyclotron Centre India
Brookhaven National Laboratory
Indian Institute of Technology Patna
Abilene Christian University
Universidad de Tarapacá
University of California at Riverside
University of Houston
University of Jammu
Stony Brook University
Czech Academy of Sciences
Chinese Academy of Sciences
Yale University
University of California at Davis
Lawrence Berkeley National Laboratory
University of California at Los Angeles
Indiana University Bloomington
National Institute of Technology, Durgapur
Shandong University
Fudan University
Tsinghua University
University of California at Berkeley
Eötvös Loránd University
University of Illinois at Chicago
Heidelberg University

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We report on new measurements of elliptic flow (v₂) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at s_{_NN} = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (e^HF) in Au+Au collisions at s_{_NN} = 54.4 GeV exhibit a non-zero v₂ in the transverse momentum (p_T) region of p_T< 2 GeV/c with the magnitude comparable to that at s_{_NN}=200 GeV. The measured e^HF v₂ at 54.4 GeV is also consistent with the expectation of their parent charm hadron v₂ 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 s_{_NN}=54.4 GeV. The measured e^HF v₂ in Au+Au collisions at s_{_NN}= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v₂ for different flavor particles (π,ϕ,D⁰/e^HF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.

Original language	English
Article number	138071
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	844
DOIs	https://doi.org/10.1016/j.physletb.2023.138071
State	Published - Sep 10 2023

Keywords

Charm quark spatial diffusion coefficient
Elliptic flow
Heavy-flavor decay electron

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10.1016/j.physletb.2023.138071

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@article{eab5dcd4f79a4296a5df357f1272074b,

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

abstract = "We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 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 sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.",

keywords = "Charm quark spatial diffusion coefficient, Elliptic flow, Heavy-flavor decay electron",

author = "\{The STAR collaboration\} and Abdulhamid, \{M. I.\} and Aboona, \{B. E.\} and J. Adam and L. Adamczyk and Adams, \{J. R.\} and I. Aggarwal and Aggarwal, \{M. M.\} and Z. Ahammed and Anderson, \{D. M.\} and Aschenauer, \{E. C.\} and S. Aslam and J. Atchison and V. Bairathi and W. Baker and \{Ball Cap\}, \{J. G.\} and K. Barish and R. Bellwied and P. Bhagat and A. Bhasin and S. Bhatta and J. Bielcik and J. Bielcikova and Brandenburg, \{J. D.\} and Cai, \{X. Z.\} and H. Caines and \{Calder{\'o}n de la Barca S{\'a}nchez\}, M. and D. Cebra and J. Ceska and I. Chakaberia and P. Chaloupka and Chan, \{B. K.\} and Z. Chang and A. Chatterjee and D. Chen and J. Chen and Chen, \{J. H.\} and Z. Chen and J. Cheng and Y. Cheng and S. Choudhury and W. Christie and X. Chu and Crawford, \{H. J.\} and M. Csan{\'a}d and G. Dale-Gau and A. Das and M. Daugherity and Deppner, \{I. M.\} and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2023.138071",

language = "English",

volume = "844",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at sNN = 27 and 54.4 GeV at RHIC

AU - The STAR collaboration

AU - Abdulhamid, M. I.

AU - Aboona, B. E.

AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Aggarwal, I.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Anderson, D. M.

AU - Aschenauer, E. C.

AU - Aslam, S.

AU - Atchison, J.

AU - Bairathi, V.

AU - Baker, W.

AU - Ball Cap, J. G.

AU - Barish, K.

AU - Bellwied, R.

AU - Bhagat, P.

AU - Bhasin, A.

AU - Bhatta, S.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Brandenburg, J. D.

AU - Cai, X. Z.

AU - Caines, H.

AU - Calderón de la Barca Sánchez, M.

AU - Cebra, D.

AU - Ceska, J.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chan, B. K.

AU - Chang, Z.

AU - Chatterjee, A.

AU - Chen, D.

AU - Chen, J.

AU - Chen, J. H.

AU - Chen, Z.

AU - Cheng, J.

AU - Cheng, Y.

AU - Choudhury, S.

AU - Christie, W.

AU - Chu, X.

AU - Crawford, H. J.

AU - Csanád, M.

AU - Dale-Gau, G.

AU - Das, A.

AU - Daugherity, M.

AU - Deppner, I. M.

AU - Jia, J.

AU - Lacey, R.

PY - 2023/9/10

Y1 - 2023/9/10

N2 - We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 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 sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.

AB - We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 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 sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.

KW - Charm quark spatial diffusion coefficient

KW - Elliptic flow

KW - Heavy-flavor decay electron

UR - https://www.scopus.com/pages/publications/85174949211

U2 - 10.1016/j.physletb.2023.138071

DO - 10.1016/j.physletb.2023.138071

M3 - Article

AN - SCOPUS:85174949211

SN - 0370-2693

VL - 844

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138071

ER -

Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at s_{_NN} = 27 and 54.4 GeV at RHIC

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Keywords

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