Fluctuations of charge separation perpendicular to the event plane and local parity violation in root S-NN=200 GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider

0486429 - ÚJF 2018 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Barnovská, Zuzana - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Chung, Paul - Hajková, O. - Pachr, M. - Rusňák, Jan - Šumbera, Michal - Vértési, Robert … Total 367 authors
Fluctuations of charge separation perpendicular to the event plane and local parity violation in root S-NN=200 GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider.
Physical Review C. Roč. 88, č. 6 (2013), č. článku 064911. ISSN 2469-9985. E-ISSN 2469-9993
R&D Projects: GA MŠMT LA09013
Institutional support: RVO:61389005
Keywords : HOT QCD * CONSERVATION * COLLISIONS
OECD category: Nuclear physics
Impact factor: 3.881, year: 2013

Previous experimental results based on data (similar to 15 x 10(6) 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 x 10(6) 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.
Permanent Link: http://hdl.handle.net/11104/0281242