Influence of globally spin-aligned vector mesons to the measurements of the chiral magnetic effect in heavy-ion collisions

Shen, Diyu; Chen, Jinhui; Tang, Aihong; Wang, Gang

doi:10.1051/epjconf/202429604002

Title: Influence of globally spin-aligned vector mesons to the measurements of the chiral magnetic effect in heavy-ion collisions

Journal Article · 25 June 2024 · EPJ Web of Conferences (Online)

DOI: https://doi.org/10.1051/epjconf/202429604002 · OSTI ID:2448354

Shen, Diyu ^[1]; Chen, Jinhui ^[1]; Tang, Aihong ^[2]; Wang, Gang ^[3]

Fudan Univ., Shanghai (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Univ. of California, Los Angeles, CA (United States)

The chiral magnetic effect (CME) in high-energy heavy-ion collisions arises from the interplay between the chirality imbalance and the intense magnetic field and will cause a charge separation along the magnetic field direction. While the CME search is still ongoing in experiments, the non-CME contributions need to be excluded from the CME observables. In this work, we examine the influence of globally spin-aligned ρ mesons on the γ₁₁₂ correlator, the R_Ψ₂(ΔS) correlator, and the signed balance functions, via a toy model and a multiphase transport model (AMPT). We find that the CME observables are sensitive to the 00-component of the spin density matrix, ρ₀₀: they receive positive (negative) contributions when ρ₀₀ is larger (smaller) than 1/3.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012704

OSTI ID:: 2448354

Report Number(s):: BNL--226174-2024-JAAM

Journal Information:: EPJ Web of Conferences (Online), Journal Name: EPJ Web of Conferences (Online) Vol. 296; ISSN 2100-014X

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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