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Title: Procedure for measuring photon and vector meson circular polarization variation with respect to the reaction plane in relativistic heavy-ion collisions

The electromagnetic (EM) eld pattern created by spectators in relativistic heavy-ion collisions plants a seed of positive (negative) magnetic helicity in the hemisphere above (below) the reaction plane. Owing to the chiral anomaly, the magnetic helicity interacts with the fermionic helicity of the collision system, and causes photons emitted in upper- and lower-hemispheres to have different preferences in the circular polarization. Similar helicity separation for massive particles, due to the global vorticity, is also possible. In this paper, we lay down a procedure to measure the variation of the circular polarization w.r.t the reaction plane in relativistic heavy-ion collisions for massless photons, as well as similar polarization patterns for vector mesons decaying into two daughters. We propose to study the yield differentially and compare the yield between upper- and lower-hemispheres in order to identify and quantify such effects.
Authors:
 [1] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
1340405
Report Number(s):
BNL--113189-2016-JA
Journal ID: ISSN 2469-9985; PRVCAN; R&D Project: PO 004; KB0202013
Grant/Contract Number:
SC0012704; AC02-98CH10886; FG02-89ER40531; FG02-88ER40424
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS Relativistic Heavy Ion Collider