Implications of the isobar-run results for the chiral magnetic effect in heavy-ion collisions

Kharzeev, Dmitri E.; Liao, Jinfeng; Shi, Shuzhe

doi:10.1103/physrevc.106.l051903

Title: Implications of the isobar-run results for the chiral magnetic effect in heavy-ion collisions

Journal Article · Mon Nov 28 00:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.l051903· OSTI ID:1969919

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Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Indiana Univ., Bloomington, IN (United States). Center for Exploration of Energy and Matter
Stony Brook Univ., NY (United States)

The chiral magnetic effect (CME) is a macroscopic transport phenomenon induced by a quantum anomaly in the presence of chiral imbalance and an external magnetic field. Relativistic heavy ion collisions provide the unique opportunity to look for CME in a non-Abelian plasma, where the chiral imbalance is created by topological transitions similar to those occurring in the early universe. The isobar run at Relativistic Heavy Ion Collider was proposed as a way to separate the possible CME signal driven by magnetic field from the background. The first blind analysis results from this important experiment were recently released by the STAR Collaboration. Notably, under the pre-defined assumption of identical background in RuRu and ZrZr, the results are inconsistent with the presence of CME, as well as with all existing theoretical models (whether including CME or not). However the observed difference of backgrounds must be taken into account before any physical conclusion is drawn. In this paper, we show that once the observed difference in hadron multiplicity and collective flow are quantitatively taken into account, the STAR results could be consistent with a finite CME signal contribution of about (6.8 ± 2.6)%.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; FG88ER40388; PHY-2209183; FG02-88ER40388

OSTI ID:: 1969919

Alternate ID(s):: OSTI ID: 1900063; OSTI ID: 2279207; OSTI ID: 2280509

Report Number(s):: BNL-224231-2023-JAAM; TRN: US2313460

Journal Information:: Physical Review. C, Vol. 106, Issue 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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