Abstract
Event-by-event fluctuations of the multiplicities of inclusive charged particles and photons at forward rapidity in Au+Au collisions at sNN=200 GeV have been studied. The dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidence 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 base lines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A nonzero 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. We find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation owing to particle decay. Results are compared to the expectations based on the generic production mechanism of pions owing to isospin symmetry, for which no significant (<1%) deviation is observed.
Original language | English |
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Article number | 034905 |
Journal | Physical Review C - Nuclear Physics |
Volume | 91 |
Issue number | 3 |
DOIs | |
State | Published - Mar 20 2015 |
Bibliographical note
Publisher Copyright:© 2015 American Physical Society.
Funding
Funders | Funder number |
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Ministry for Education and Science of the Russian Federation | |
National Stroke Foundation | |
National Science Foundation Arctic Social Science Program | 1067907 |
National Science Foundation Arctic Social Science Program |
ASJC Scopus subject areas
- Nuclear and High Energy Physics