Challenges in flow background removal in search for the chiral magnetic effect

2016/08/31 by Fuqiang Wang, F. Wang, Jie Zhao +1 · 50 citations
Engineering · Physics and Astronomy · #Charge (physics) #Computer science #Elliptic flow #Event (particle physics) #Flow (mathematics) #Heavy ion #High-Energy Particle Collisions Research #Magnetic resonance imaging #Mechanics #Momentum (technical analysis) #Nuclear magnetic resonance #Nuclear physics #Nuclear reactor physics and engineering #Observable #Particle (ecology) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Resonance (particle physics) #SIGNAL (programming language) #Transverse plane #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.95.051901

published in Physical Review C 95(5) (American Institute of Physics)

openalex created_date 2016/09/16 · openalex publication_date 2017/05/11 · arxiv created 2017/05/12 · arxiv updated 2017/05/17 · openalex updated_date 2026/08/05

Abstract

We investigate the effect of resonance decays on the three-particle correlator charge separation observable in a search for the chiral magnetic effect, using a simple simulation with realistic inputs. We find that resonance decays can largely account for the measured signal. We suppress the elliptic flow (v₂) background by using zero event-by-event v₂ (or via the mixed-event technique). We find that the background is suppressed, but not eliminated as naively anticipated. We identify the reason to be the nonidenticalness of the resonance and final-state particle's v₂ and the induced correlation between the transverse momentum dependent resonance v₂ and decay angle. We make predictions for the charge separation signal due to resonance decays in 200 GeV Au+Au collisions.

Citations

• Charge separation induced by -odd bubbles in QCD matter
• Effects of momentum conservation and flow on angular correlations observed in experiments at the BNL Relativistic Heavy Ion Collider
• Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions
• Chiral magnetic and vortical effects in high-energy nuclear collisions—A status report
• Suppressedπ0Production at Large Transverse Momentum in CentralAu+AuCollisions atsNN=200 GeV
• Big-Bang Nucleosynthesis

Cited by

• Investigation of Experimental Observables in Search of the Chiral Magnetic Effect in Heavy-ion Collisions in the STAR experiment
• Importance of Isobar Density Distributions on the Chiral Magnetic Effect Search
• Two- and three-particle nonflow contributions to the chiral magnetic effect measurement by spectator and participant planes in relativistic heavy ion collisions
• Deciphering the RΨm correlator in search for the chiral magnetic effect in relativistic heavy ion collisions