Azimuthal charged-particle correlations and possible local strong parity violation

Parity-odd domains, corresponding to nontrivial topological solutions of the QCD vacuum, might be created during relativistic heavy-ion collisions. These domains are predicted to lead to charge separation of quarks along the system's orbital momentum axis. We investigate a three-particle azimut...

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Veröffentlicht in:	Physical review letters 2009-12, Vol.103 (25), p.251601-251601, Article 251601
Hauptverfasser:	Abelev, B I, Aggarwal, M M, Ahammed, Z, Alakhverdyants, A V, Anderson, B D, Arkhipkin, D, Averichev, G S, Balewski, J, Barannikova, O, Barnby, L S, Baumgart, S, Beavis, D R, Bellwied, R, Benedosso, F, Betancourt, M J, Betts, R R, Bhasin, A, Bhati, A K, Bichsel, H, Bielcik, J, Bielcikova, J, Biritz, B, Bland, L C, Bnzarov, I, Bonner, B E, Bouchet, J, Braidot, E, Brandin, A V, Bridgeman, A, Bruna, E, Bueltmann, S, Burton, T P, Cai, X Z, Caines, H, Calderón de la Barca Sánchez, M, Catu, O, Cebra, D, Cendejas, R, Cervantes, M C, Chajecki, Z, Chaloupka, P, Chattopadhyay, S, Chen, H F, Chen, J H, Chen, J Y, Cheng, J, Cherney, M, Chikanian, A, Choi, K E, Christie, W, Chung, P, Clarke, R F, Codrington, M J M, Corliss, R, Cormier, T M, Cosentino, M R, Cramer, J G, Crawford, H J, Das, D, Dash, S, Daugherity, M, De Silva, L C, Dedovich, T G, DePhillips, M, Derevschikov, A A, Derradi de Souza, R, Didenko, L, Djawotho, P, Dzhordzhadze, V, Dogra, S M, Dong, X, Drachenberg, J L, Draper, J E, Dunlop, J C, Dutta Mazumdar, M R, Efimov, L G, Elhalhuli, E, Elnimr, M, Engelage, J, Eppley, G, Erazmus, B, Estienne, M, Eun, L, Fachini, P, Fatemi, R, Fedorisin, J, Feng, A, Filip, P, Finch, E, Fine, V, Fisyak, Y, Gagliardi, C A, Gangadharan, D R, Ganti, M S, Garcia-Solis, E J, Geromitsos, A, Geurts, F, Ghazikhanian, V, Ghosh, P, Gorbunov, Y N
Format:	Artikel
Sprache:	eng
Schlagworte:	ATOMIC AND MOLECULAR PHYSICS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS HADRONS HEAVY IONS ION COLLISIONS PARITY PARTICLE RAPIDITY PHYSICS OF ELEMENTARY PARTICLES AND FIELDS QUANTUM CHROMODYNAMICS QUARKS
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Zusammenfassung:	Parity-odd domains, corresponding to nontrivial topological solutions of the QCD vacuum, might be created during relativistic heavy-ion collisions. These domains are predicted to lead to charge separation of quarks along the system's orbital momentum axis. We investigate a three-particle azimuthal correlator which is a P even observable, but directly sensitive to the charge separation effect. We report measurements of charged hadrons near center-of-mass rapidity with this observable in Au + Au and Cu + Cu collisions at square root of s(NN) = 200 GeV using the STAR detector. A signal consistent with several expectations from the theory is detected. We discuss possible contributions from other effects that are not related to parity violation.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.103.251601