The effect of the fluctuating proton size on the study of 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 AA collisions. This result opens a possibility of studying the chiral magnetic effect in small systems.

arXiv comment14 pages, 6 figures

References in corpus (36)

• The Chiral Magnetic Effect
• Computing Quark and Gluon Distribution Functions for Very Large Nuclei
• The effects of topological charge change in heavy ion collisions: "Event by event P and CP violation"
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Chiral Magnetic and Vortical Effects in High-Energy Nuclear Collisions --- A Status Report
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Parity violation in hot QCD: why it can happen, and how to look for it
• Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
• The Chiral Magnetic Effect and Anomaly-Induced Transport
• Multiplicity and transverse-momentum dependence of two- and four-particle correlations in pPb and PbPb collisions
• "Strongly interacting matter in magnetic fields": an overview
• Evidence for collectivity in pp collisions at the LHC
• Possibility of spontaneous parity violation in hot QCD
• Parity violation in hot QCD: how to detect it
• Charge separation relative to the reaction plane in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Measurement of the Inelastic Proton-Proton Cross Section at $\sqrt{s}=13$ TeV with the ATLAS Detector at the LHC
• Deep inelastic scattering as a probe of entanglement
• Beam-energy dependence of charge separation along the magnetic field in Au+Au collisions at RHIC
• Charge conservation in RHIC and contributiuons to local parity violation observables
• Charged particle multiplicities in pp interactions at sqrt(s) = 0.9, 2.36, and 7 TeV
• Effects of Cluster Particle Correlations on Local Parity Violation Observables
• Observation of charge-dependent azimuthal correlations in pPb collisions and its implication for the search for the chiral magnetic effect
• The PHOBOS Glauber Monte Carlo
• Azimuthal correlations from transverse momentum conservation and possible local parity violation
• Measurement of Elastic pp Scattering at $\sqrt{s}$ = 8 TeV in the Coulomb-Nuclear Interference Region - Determination of the $\rho$-Parameter and the Total Cross-Section
• Charge-Dependent Correlations in Relativistic Heavy Ion Collisions and the Chiral Magnetic Effect
• Test the chiral magnetic effect with isobaric collisions
• Constraining the magnitude of the Chiral Magnetic Effect with Event Shape Engineering in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76$ TeV
• Color fluctuation effects in proton-nucleus collisions
• Multiplicity and rapidity dependence of strange hadron production in pp, pPb, and PbPb collisions at the LHC
• Challenges in flow background removal in search for the chiral magnetic effect
• To CME or not to CME? Implications of p+Pb measurements of the chiral magnetic effect in heavy ion collisions
• Nucleon-nucleon collision profile and cross section fluctuations
• Fluctuations of charge separation perpendicular to the event plane and local parity violation in sqrt(sNN)=200 GeV Au+Au collisions at RHIC
• Higher order string effects and the properties of the Pomeron
• Very forward measurements at the LHC

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• Experimental searches for the chiral magnetic effect in heavy-ion collisions
• Charge-dependent pair correlations relative to a third particle in $p$+Au and $d$+Au collisions at RHIC
• Two-particle azimuthal correlations as a probe of collective behaviour in deep inelastic $\text{ep}$ scattering at HERA
• Chiral Magnetic Effect in Heavy Ion Collisions: The Present and Future
• Nucleon dissociation and incoherent $J/\psi$ photoproduction on nuclei in ion ultraperipheral collisions at the CERN Large Hadron Collider
• Search for the Chiral Magnetic Effect in Relativistic Heavy-Ion Collisions
• Status of CME Search Before Isobar Collisions and Methods of Blind Analysis From STAR