Indications of conical emission of charged hadrons at the BNL relativistic heavy ion collider

• Published in: Physical review letters 2009-02, Vol.102 (5), p.052302-052302, Article 052302
• Main Authors: Abelev, B I, Aggarwal, M M, Ahammed, Z, Anderson, B D, Arkhipkin, D, Averichev, G S, Bai, Y, Balewski, J, Barannikova, O, Barnby, L S, Baudot, J, Baumgart, S, Beavis, D R, Bellwied, R, Benedosso, F, Betts, R R, Bhardwaj, S, Bhasin, A, Bhati, A K, Bichsel, H, Bielcik, J, Bielcikova, J, Biritz, B, Bland, L C, Bombara, M, Bonner, B E, Botje, M, Bouchet, J, Braidot, E, Brandin, A V, Bruna, E, Bueltmann, S, Burton, T P, Bystersky, M, Cai, X Z, Caines, H, Calderón de la Barca Sánchez, M, Callner, J, 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, S U, Clarke, R F, Codrington, M J M, Coffin, J P, Cormier, T M, Cosentino, M R, Cramer, J G, Crawford, H J, Das, D, Dash, S, Daugherity, M, De Silva, C, de Moura, M M, Dedovich, T G, Dephillips, M, Derevschikov, A A, de Souza, R Derradi, Didenko, L, Djawotho, P, Dogra, S M, Dong, X, Drachenberg, J L, Draper, J E, Du, F, Dunlop, J C, Dutta Mazumdar, M R, Edwards, W R, Efimov, L G, Elhalhuli, E, Elnimr, M, Emelianov, V, 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, Gaillard, L, Gangadharan, D R
• Format: Article
• Language: English
• Subjects: BNL; BROOKHAVEN RHIC; EMISSION; GEV RANGE 100-1000; HADRONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; TRANSVERSE MOMENTUM
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/physrevlett.102.052302

Three-particle azimuthal correlation measurements with a high transverse momentum trigger particle are reported for pp, d+Au, and Au+Au collisions at sqrt[s_{NN}]=200 GeV by the STAR experiment. Dijet structures are observed in pp, d+Au and peripheral Au+Au collisions. An additional structure is observed in central Au+Au data, signaling conical emission of correlated charged hadrons. The conical emission angle is found to be theta=1.37+/-0.02(stat)-0.07+0.06(syst), independent of p_{ perpendicular}.