Fluctuations of charge separation perpendicular to the event plane and local parity violation in √sNN = 200 GeV Au+Au collisions at RHIC (CROSBI ID 210380)
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Podaci o odgovornosti
Adamczyk, L. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zyzak, M.
engleski
Fluctuations of charge separation perpendicular to the event plane and local parity violation in √sNN = 200 GeV Au+Au collisions at RHIC
Previous experimental results based on data (∼15×106 events) collected by the STAR detector at the BNL Relativistic Heavy Ion Collider suggest event-by-event charge-separation fluctuations perpendicular to the event plane in noncentral heavy-ion collisions. Here we present the correlator previously used split into its two component parts to reveal correlations parallel and perpendicular to the event plane. The results are from a high-statistics 200-GeV Au + Au collisions data set (57×106 events) collected by the STAR experiment. We explicitly count units of charge separation from which we find clear evidence for more charge-separation fluctuations perpendicular than parallel to the event plane. We also employ a modified correlator to study the possible 𝒫-even background in same- and opposite-charge correlations, and find that the 𝒫-even background may largely be explained by momentum conservation and collective motion.
charge; fluctuation; STAR
STAR Collaboration.
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Podaci o izdanju
88
2013.
64911-1-64911-10
objavljeno
0556-2813
10.1103/PhysRevC.88.064911