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

Abstract

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 AAmore » collisions. Here, this result opens a possibility of studying the chiral magnetic effect in small systems.« less

Authors:
 [1];  [2];  [2];  [2]
  1. Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Rice Univ., Houston, TX (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1439312
Alternate Identifier(s):
OSTI ID: 1420198
Report Number(s):
BNL-205707-2018-JAAM
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1900600
Grant/Contract Number:  
SC0012704; FG-88ER40388; AC02-98CH10886; SC0012185
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Kharzeev, Dmitri, Tu, Zhoudunming, Zhang, Aobo, and Li, Wei. Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.024905.
Kharzeev, Dmitri, Tu, Zhoudunming, Zhang, Aobo, & Li, Wei. Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions. United States. doi:10.1103/PhysRevC.97.024905.
Kharzeev, Dmitri, Tu, Zhoudunming, Zhang, Aobo, and Li, Wei. Mon . "Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions". United States. doi:10.1103/PhysRevC.97.024905. https://www.osti.gov/servlets/purl/1439312.
@article{osti_1439312,
title = {Effect of the fluctuating proton size on the study of the chiral magnetic effect in proton-nucleus collisions},
author = {Kharzeev, Dmitri and Tu, Zhoudunming and Zhang, Aobo and Li, Wei},
abstractNote = {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.},
doi = {10.1103/PhysRevC.97.024905},
journal = {Physical Review C},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

Figure 1 Figure 1: A sketch of the proton configurations probed in the minimum bias (left) and high multiplicity (right) events.

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