Beam-energy dependence of charge separation along the magnetic field in Au+Au collisions at RHIC

Local parity-odd domains are theorized to form inside a quark-gluon plasma which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect. The experimental observation of...

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Veröffentlicht in:	Physical review letters 2014-08, Vol.113 (5), p.052302-052302, Article 052302
Hauptverfasser:	Adamczyk, L, Adkins, J K, Agakishiev, G, Aggarwal, M M, Ahammed, Z, Alekseev, I, Alford, J, Anson, C D, Aparin, A, Arkhipkin, D, Aschenauer, E C, Averichev, G S, Banerjee, A, Beavis, D R, Bellwied, R, Bhasin, A, Bhati, A K, Bhattarai, P, Bichsel, H, Bielcik, J, Bielcikova, J, Bland, L C, Bordyuzhin, I G, Borowski, W, Bouchet, J, Brandin, A V, Brovko, S G, Bültmann, S, Bunzarov, I, Burton, T P, Butterworth, J, Caines, H, Calderón de la Barca Sánchez, M, Cebra, D, Cendejas, R, Cervantes, M C, Chaloupka, P, Chang, Z, Chattopadhyay, S, Chen, H F, Chen, J H, Chen, L, Cheng, J, Cherney, M, Chikanian, A, Christie, W, Chwastowski, J, Codrington, M J M, Contin, G, Cramer, J G, Crawford, H J, Cui, X, Das, S, Davila Leyva, A, De Silva, L C, Debbe, R R, Dedovich, T G, Deng, J, Derevschikov, A A, Derradi de Souza, R, Dhamija, S, di Ruzza, B, Didenko, L, Dilks, C, Ding, F, Djawotho, P, Dong, X, Drachenberg, J L, Draper, J E, Du, C M, Dunkelberger, L E, Dunlop, J C, Efimov, L G, Engelage, J, Engle, K S, Eppley, G, Eun, L, Evdokimov, O, Eyser, O, Fatemi, R, Fazio, S, Fedorisin, J, Filip, P, Finch, E, Fisyak, Y, Flores, C E, Gagliardi, C A, Gangadharan, D R, Garand, D, Geurts, F, Gibson, A, Girard, M, Gliske, S, Greiner, L, Grosnick, D, Gunarathne, D S, Guo, Y, Gupta, A, Gupta, S, Guryn, W
Format:	Artikel
Sprache:	eng
Schlagworte:	Beams (radiation) Charge Collisions Correlation Dominance Magnetic fields Nuclear Experiment Physics Quark-gluon plasma Separation
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Zusammenfassung:	Local parity-odd domains are theorized to form inside a quark-gluon plasma which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect. The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this Letter, we present the results of the beam-energy dependence of the charge correlations in Au+Au collisions at midrapidity for center-of-mass energies of 7.7, 11.5, 19.6, 27, 39, and 62.4 GeV from the STAR experiment. After background subtraction, the signal gradually reduces with decreased beam energy and tends to vanish by 7.7 GeV. This implies the dominance of hadronic interactions over partonic ones at lower collision energies.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.113.052302