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

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arxiv 1608.06610 v2 pith:BKLWVXIN submitted 2016-08-23 nucl-th nucl-ex

classification nucl-thnucl-ex
keywords resonancebackgrounddecayseffectchargechiralfindflow
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We investigate the effect of resonance decays on the three-particle correlator charge separation observable in 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 ($v_2$) background by using zero event-by-event $v_2$ (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 non-identicalness of the resonance and final-state particle's $v_2$ and the induced correlation between the transverse momentum dependent resonance $v_2$ and decay angle. We make predictions for the charge separation signal due to resonance decays in 200~GeV Au+Au collisions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Back-to-back relative-excess observable in search for the chiral magnetic effect

    nucl-th 2019-08 conditional novelty 5.0 of 10

    The back-to-back relative OS/SS pair excess r_BB(ϕ_BB) is sensitive to the chiral magnetic effect and far less affected by resonance-decay backgrounds than the standard Δγ observable.

  2. Event-by-event analysis of chiral charge separation in $p^{\uparrow}+$Au collisions within an improved AMPT model

    hep-ph 2026-08 conditional novelty 4.0 of 10

    An event-by-event CME source in an improved AMPT model predicts a surviving charge-separation signal in p+A collisions, strongest for the IV minus II geometry difference.

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