Chiral magnetic effect search in p(d)+Au, Au+Au collisions at RHIC
Jie Zhao (for the STAR collaboration)
TL;DR
This paper investigates the chiral magnetic effect in heavy-ion collisions at RHIC, focusing on background sources using small system collisions and resonance mass dependence to improve CME signal detection.
Contribution
It introduces two new STAR studies that help distinguish CME signals from background effects in heavy-ion collision experiments.
Findings
No CME signal expected in small system collisions.
Resonance peaks identified via pair invariant mass analysis.
Enhanced understanding of background contributions to CME measurements.
Abstract
The chiral magnetic effect (CME) refers to charge separation along a strong magnetic field of single-handed quarks, caused by interactions with topological gluon fields from QCD vacuum fluctuations. A major background of CME measurements in heavy-ion collisions comes from resonance decays coupled with elliptical flow anisotropy. These proceedings present two new studies from STAR to shed further light on the background issue: (1) small system p+Au and d+Au collisions where the CME signal is not expected, and (2) pair invariant mass dependence where resonance peaks can be identified.
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