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Title: Charged-to-neutral correlation at forward rapidity in Au+Au collisions at s NN = 200 GeV

Journal Article · · Physical Review. C. Nuclear Physics
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Event-by-event fluctuations of the ratio of inclusive charged to photon multiplicities at forward rapidity in Au+Au collision at √sNN=200 GeV have been studied. Dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidences of dynamical fluctuations of different physical origins. Observables constructed out of moments of multiplicities are used as measures of fluctuations. Mixed events and model calculations are used as baselines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A non-zero statistically significant signal of dynamical fluctuations is observed in excess to the model prediction when charged particles and photons are measured in the same acceptance. Thus, we find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation due to particle decay. Results are compared to the expectations based on the generic production mechanism of pions due to isospin symmetry, for which no significant (< 1%) deviation is observed.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC00112704
OSTI ID:
1184516
Alternate ID(s):
OSTI ID: 1180786
Report Number(s):
BNL-107987-2015-JA; PRVCAN; R&D Project: PO 004; KB0202012
Journal Information:
Physical Review. C. Nuclear Physics, Vol. 91, Issue 3; ISSN 0556-2813
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (8)