Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions

Kharzeev, Dmitri; Tu, Zhoudunming; Zhang, Aobo; Li, Wei

doi:10.1103/PhysRevC.97.024905

Title: Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions

Journal Article · Mon Feb 12 00:00:00 EST 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.024905· OSTI ID:1439312

Kharzeev, Dmitri ^[1]; Tu, Zhoudunming ^[2]; Zhang, Aobo ^[2]; Li, Wei ^[2]

Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Rice Univ., Houston, TX (United States)

High energy proton-nucleus (pA) collisions provide an important constraint on the study of the chiral magnetic effect in QCD matter. Naively, in pA collisions one expects no correlation between the orientation of event plane as reconstructed from the azimuthal distribution of produced hadrons and the orientation of magnetic field. If this is the case, any charge-dependent hadron correlations can only result from the background. Nevertheless, in this paper we point out that in high multiplicity pA collisions a correlation between the magnetic field and the event plane can appear. This is because triggering on the high hadron multiplicity amounts to selecting Fock components of the incident proton with a large number of partons that are expected to have a transverse size much larger than the average proton size. We introduce the effect of the fluctuating proton size in the Monte Carlo Glauber model and evaluate the resulting correlation between the magnetic field and the second-order event plane in both pA and nucleus-nucleus (AA) collisions. The fluctuating proton size is found to result in a significant correlation between magnetic field and the event plane in pA collisions, even though the magnitude of the correlation is still much smaller than in AA collisions. Here, this result opens a possibility of studying the chiral magnetic effect in small systems.

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

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704; FG-88ER40388; AC02-98CH10886; SC0012185

OSTI ID:: 1439312

Alternate ID(s):: OSTI ID: 1420198

Report Number(s):: BNL-205707-2018-JAAM; PRVCAN; TRN: US1900600

Journal Information:: Physical Review C, Vol. 97, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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