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fcme in Au+Au 200 GeV after background estimate

Updated on Fri, 2024-11-15 09:53. Originally created by fengyich on 2024-08-17 20:50.

Title: Evidence of Possible Chiral Magnetic Effect in Au+Au Collisions at √s_NN=200 GeV at the Relativistic Heavy Ion Collider

PAs: Yicheng Feng, Haojie Xu, Jie Zhao, Fuqiang Wang

Targeted journal: PRL

Abstract:
Vacuum fluctuations of the topological gluon field in quantum chromodynamics will produce a chirality imbalance of quarks and, in a strong magnetic field, a subsequent electric current, a phenomenon called the chiral magnetic effect (CME). We report an evidence of a possible CME signal in Au+Au collisions at nucleon-nucleon center-of-mass energy of √sNN=200 GeV at BNL's Relativistic Heavy Ion Collider by a charge-dependent azimuthal correlator after removal of flow-induced backgrounds and nonflow contamination. The significance of the CME signal is 3.4 standard deviation.

Conclusion:
After eliminating flow-induced backgrounds and nonflow contamination, we report an evidence of a possible CME signal in 20--50\% centrality Au+Au collisions at √s_NN=200 GeV with a signal fraction of f_CME=(25±7±2)% in the measured inclusive Δγ, a 3.4 standard deviation away from, or a 3.4×10^-4 probability to be a fluctuation of, a null signal.

Status:
2024/08/21, FCV meeting, paper proposal, drupal.star.bnl.gov/STAR/system/files/Fcme20240818_v3.pdf

Paper draft:

Analysis note:

CVS:

Previous presentations:
2024/11/14, PWGC preview, drupal.star.bnl.gov/STAR/system/files/Fcme20241115_PWGC_preview_v2.pdf
2024/10/23, STAR Collaboration meeting, drupal.star.bnl.gov/STAR/system/files/Fcme20241021.pdf
2024/08/21, FCV meeting, paper proposal, drupal.star.bnl.gov/STAR/system/files/Fcme20240818_v3.pdf
2024/08/14, FCV meeting, drupal.star.bnl.gov/STAR/system/files/Fcme20240812_v2.pdf
2024/08/09, CME-fg meeting, drupal.star.bnl.gov/STAR/system/files/Fcme20240807_v3.pdf
2024/07/24, FCV meeting, drupal.star.bnl.gov/STAR/system/files/FlowDecor20240721.pdf
2024/05/15, CME-fg meeting, drupal.star.bnl.gov/STAR/system/files/Fcme20240514_v4.pdf
2024/04/02, FCV meeting, drupal.star.bnl.gov/STAR/system/files/Fcme20240402.pdf

Figures:

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