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

STAR Collaboration

doi:10.1016/j.physletb.2025.139245

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

STAR Collaboration

Institute of Higher Research

Texas A&M University
Czech Technical University in Prague
Joint Institute for Nuclear Research
Panjab University
Brookhaven National Laboratory
Variable Energy Cyclotron Centre
Alikhanov Institute for Theoretical and Experimental Physics
Moscow Engineering Physics Institute
Indian Institute of Technology Patna
Abilene Christian University
Universidad de Tarapacá
Shandong University
University of California at Riverside
Indian Institute of Science Education and Research, Tirupati
University of Jammu
Stony Brook University
Ohio State University
University of Houston
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
Fudan University
Guangxi Normal University
Tsinghua University
University of California at Berkeley
University of Illinois at Chicago
Heidelberg University
Institute for High Energy Physics
Indian Institute of Science Education and Research, Berhampur
Kent State University
Rice University
University of Tsukuba
University of Kentucky
University of Calabria
Purdue University
Southern Connecticut State University
CAS - Institute of Modern Physics
Temple University
Valparaiso University
Huzhou University
American University in 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
Eötvös Loránd University
Sejong University
Rutgers - The State University of New Jersey, New Brunswick
University of Texas at Austin
Max Planck Institute for Physics (Werner Heisenberg Institute)
Creighton University
Ball State University
Michigan State University
Argonne National Laboratory
AGH University of Krakow
Academia Sinica Taiwan HQ
Chongqing University
Lanzhou University
Goethe University Frankfurt

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, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	862
DOIs	https://doi.org/10.1016/j.physletb.2025.139245
State	Published - Mar 2025

Keywords

Directed flow
Electric charge
Electromagnetic field
Heavy-ion collisions
Strangeness

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10.1016/j.physletb.2025.139245

Cite this

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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 (“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.",

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

author = "Aboona, \{B. E.\} and J. Adam and G. Agakishiev and I. Aggarwal and S. Kabana and \{STAR Collaboration\}",

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

issn = "0370-2693",

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TY - JOUR

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

AU - Aboona, B. E.

AU - Adam, J.

AU - Agakishiev, G.

AU - Aggarwal, I.

AU - Kabana, S.

AU - STAR Collaboration

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

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

M1 - 139245

ER -

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

Abstract

Keywords

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