Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions

The STAR Collaboration

doi:10.1016/j.physletb.2025.139245

Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions

The STAR Collaboration

Texas A and M University
Czech Technical University in Prague
Joint Inst. for Nuclear Research
Panjab University
VECC Kolkata
ITEP
National Research Nuclear University MEPhI
Iit Patna
Abilene Christian University
Universidad de Tarapacá
Shandong University
University of California, Riverside
Iiser Tirupati
University of Jammu
SUNY
Ohio State University
University of Houston
Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Yale University
University of California, Davis
Lawrence Berkeley National Laboratory
University of California at Los Angeles
Indiana University Bloomington
National Institute of Technology, Durgapur
Fudan University
Guangxi Normal University
Tsinghua University
Brookhaven National Laboratory
University of California at Berkeley
UIC ECE-CSN-Lab
Heidelberg University
Institute for High Energy Physics (IHEP)
Iiser Berhampur
Kent State University
Rice University
Tsukuba University
University of Kentucky
Universite della Calabria
Purdue University
Southern Connecticut State University
Institute of Modern Physics Chinese Academy of Sciences
Temple University
Valparaiso University
Huzhou University
The American University in Cairo Cairo
University of Chinese Academy of Sciences
National Cheng Kung University
Central China Normal University
University of Science and Technology of China
Wayne State University
Lehigh University
Wuhan University of Science and Technology
South China Normal University
National Institute of Science Education and Research
Eotvos Lorand University (ELTE)
Sejong University
Rutgers University–New Brunswick
University of Texas at Austin
Max-Planck-Institut für Physik
Creighton University
Ball State University
Michigan State University
Argonne National Laboratory
Univ of Mining and Metallurgy
Academica Sinica
Chongqing University
Second Hospital of Lanzhou University
Frankfurt Institute for Advanced Studies

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

Abstract

We report directed flow (v₁) of multistrange baryons (Ξ and Ω) and improved v₁ data for K⁻, p¯, Λ¯ and ϕ in Au+Au collisions at s_NN=27 and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). We focus on particles whose constituent quarks are not transported from the incoming nuclei but instead are produced in the collisions. At intermediate impact parameters, we examine quark coalescence behavior for particle combinations with identical quark content, and search for any departure from this behavior (“splitting”) for combinations having non-identical quark content. Under the assumption of quark coalescence for produced quarks, the splitting strength appears to increase with the electric charge difference of the constituent quarks in the combinations, consistent with electromagnetic effect expectations.

Original language	English
Article number	139245
Journal	Physics Letters B
Volume	862
DOIs	https://doi.org/10.1016/j.physletb.2025.139245
State	Published - Mar 2025
Externally published	Yes

Keywords

Directed flow
Electric charge
Electromagnetic field
Heavy-ion collisions
Strangeness

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10.1016/j.physletb.2025.139245

Cite this

@article{4e0652a594db4bb986a2b33d22c2f5e4,

title = "Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions",

abstract = "We report directed flow (v1) of multistrange baryons (Ξ and Ω) and improved v1 data for K−, p¯, Λ¯ and ϕ in Au+Au collisions at sNN=27 and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). We focus on particles whose constituent quarks are not transported from the incoming nuclei but instead are produced in the collisions. At intermediate impact parameters, we examine quark coalescence behavior for particle combinations with identical quark content, and search for any departure from this behavior ({\textquotedblleft}splitting{\textquotedblright}) for combinations having non-identical quark content. Under the assumption of quark coalescence for produced quarks, the splitting strength appears to increase with the electric charge difference of the constituent quarks in the combinations, consistent with electromagnetic effect expectations.",

keywords = "Directed flow, Electric charge, Electromagnetic field, Heavy-ion collisions, Strangeness",

author = "\{The STAR Collaboration\} and Aboona, \{B. E.\} and J. Adam and G. Agakishiev and I. Aggarwal and Aggarwal, \{M. M.\} and Z. Ahammed and A. Aitbaev and I. Alekseev and E. Alpatov and A. Aparin and S. Aslam and J. Atchison and Averichev, \{G. S.\} and V. Bairathi and X. Bao and K. Barish and S. Behera and P. Bhagat and A. Bhasin and S. Bhatta and Bordyuzhin, \{I. G.\} and Brandenburg, \{J. D.\} and Brandin, \{A. V.\} and C. Broodo 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 Chan, \{B. K.\} and Z. Chang and A. Chatterjee and D. Chen and J. Chen and Chen, \{J. H.\} and Q. Chen and Z. Chen and J. Cheng and Y. Cheng and W. Christie and X. Chu and S. Corey and Crawford, \{H. J.\} and G. Dale-Gau and A. Das and Dedovich, \{T. G.\} and Deppner, \{I. M.\} and Derevschikov, \{A. A.\} and A. Deshpande",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s)",

year = "2025",

month = mar,

doi = "10.1016/j.physletb.2025.139245",

language = "English",

volume = "862",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions

AU - The STAR Collaboration

AU - Aboona, B. E.

AU - Adam, J.

AU - Agakishiev, G.

AU - Aggarwal, I.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Aitbaev, A.

AU - Alekseev, I.

AU - Alpatov, E.

AU - Aparin, A.

AU - Aslam, S.

AU - Atchison, J.

AU - Averichev, G. S.

AU - Bairathi, V.

AU - Bao, X.

AU - Barish, K.

AU - Behera, S.

AU - Bhagat, P.

AU - Bhasin, A.

AU - Bhatta, S.

AU - Bordyuzhin, I. G.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Broodo, C.

AU - Cai, X. Z.

AU - Caines, H.

AU - Calderón de la Barca Sánchez, M.

AU - Cebra, D.

AU - Ceska, J.

AU - Chakaberia, I.

AU - Chan, B. K.

AU - Chang, Z.

AU - Chatterjee, A.

AU - Chen, D.

AU - Chen, J.

AU - Chen, J. H.

AU - Chen, Q.

AU - Chen, Z.

AU - Cheng, J.

AU - Cheng, Y.

AU - Christie, W.

AU - Chu, X.

AU - Corey, S.

AU - Crawford, H. J.

AU - Dale-Gau, G.

AU - Das, A.

AU - Dedovich, T. G.

AU - Deppner, I. M.

AU - Derevschikov, A. A.

AU - Deshpande, A.

PY - 2025/3

Y1 - 2025/3

N2 - We report directed flow (v1) of multistrange baryons (Ξ and Ω) and improved v1 data for K−, p¯, Λ¯ and ϕ in Au+Au collisions at sNN=27 and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). We focus on particles whose constituent quarks are not transported from the incoming nuclei but instead are produced in the collisions. At intermediate impact parameters, we examine quark coalescence behavior for particle combinations with identical quark content, and search for any departure from this behavior (“splitting”) for combinations having non-identical quark content. Under the assumption of quark coalescence for produced quarks, the splitting strength appears to increase with the electric charge difference of the constituent quarks in the combinations, consistent with electromagnetic effect expectations.

AB - We report directed flow (v1) of multistrange baryons (Ξ and Ω) and improved v1 data for K−, p¯, Λ¯ and ϕ in Au+Au collisions at sNN=27 and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). We focus on particles whose constituent quarks are not transported from the incoming nuclei but instead are produced in the collisions. At intermediate impact parameters, we examine quark coalescence behavior for particle combinations with identical quark content, and search for any departure from this behavior (“splitting”) for combinations having non-identical quark content. Under the assumption of quark coalescence for produced quarks, the splitting strength appears to increase with the electric charge difference of the constituent quarks in the combinations, consistent with electromagnetic effect expectations.

KW - Directed flow

KW - Electric charge

KW - Electromagnetic field

KW - Heavy-ion collisions

KW - Strangeness

UR - https://www.scopus.com/pages/publications/85216089706

U2 - 10.1016/j.physletb.2025.139245

DO - 10.1016/j.physletb.2025.139245

M3 - Article

AN - SCOPUS:85216089706

SN - 0370-2693

VL - 862

JO - Physics Letters B

JF - Physics Letters B

M1 - 139245

ER -

Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions

Abstract

Keywords

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