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

Fuqiang Wang and Jie Zhao
Phys. Rev. C 95, 051901(R) – Published 11 May 2017

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.

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  • Received 10 February 2017

DOI:https://doi.org/10.1103/PhysRevC.95.051901

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Fuqiang Wang1,2 and Jie Zhao2,*

  • 1School of Science, Huzhou University, Huzhou, Zhejiang 313000, China
  • 2Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA

  • *zhao656@purdue.edu

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Issue

Vol. 95, Iss. 5 — May 2017

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