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

Tang, A. H.; Wang, G.

doi:10.1103/PhysRevC.94.024920

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

Journal Article · Tue Aug 30 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.024920· OSTI ID:1340405

Tang, A. H. ^[1]; Wang, G. ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy

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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: SC0012704; AC02-98CH10886; FG02-89ER40531; FG02-88ER40424

OSTI ID:: 1340405

Alternate ID(s):: OSTI ID: 1312055

Report Number(s):: BNL--113189-2016-JA; KB0202013

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 94; ISSN PRVCAN; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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