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

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

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3 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

Bibliographical note

Publisher Copyright:
© 2023 The Author(s)

Funding

We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, National Natural Science Foundation of China, Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education, the Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre and WUT ID-UB of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF), Helmholtz Association, Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS). We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation , National Natural Science Foundation of China , Chinese Academy of Science , the Ministry of Science and Technology of China and the Chinese Ministry of Education , the Higher Education Sprout Project by Ministry of Education at NCKU , the National Research Foundation of Korea , Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic , Hungarian National Research, Development and Innovation Office , New National Excellency Programme of the Hungarian Ministry of Human Capacities , Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre and WUT ID-UB of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF), Helmholtz Association , Ministry of Education, Culture, Sports, Science and Technology ( MEXT ) and Japan Society for the Promotion of Science (JSPS).

Funders	Funder number
Department of Atomic Energy and Department of Science and Technology
Hungarian Ministry of Human Capacities
Ministry of Education at NCKU
RHIC Operations Group
WUT ID-UB of Poland
National Science Foundation Arctic Social Science Program
Office of Science Programs
Institute for Nuclear Physics
Riley Children's Foundation
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China (NSFC)
Ministerstvo Školství, Mládeže a Tělovýchovy
Grantová Agentura České Republiky
Ministry of Education of the People's Republic of China
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
Ministarstvo Obrazovanja, Znanosti i Sporta
National Research Foundation of Korea
Narodowe Centrum Nauki
Max Delbrück Center for Molecular Medicine in the Helmholtz Association
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal

Keywords

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

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2023.138071

Cite this

@article{457fff8aa8294b2992e45a415b9b76be,

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 = "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 A. Dhamija and R. Fatemi",

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",

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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 - 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 - Dhamija, A.

AU - Fatemi, 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

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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 -