Disappearance of back-to-back high-pT hadron correlations in central Au+Au collisions at sqrt[s NN ] =200 GeV

Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudorapidity range and full azimuth in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV. The small-angle correlations observed in p+p collisions and at all centralities of Au+Au collisions are charac...

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Published in:Physical review letters 2003-02, Vol.90 (8), p.082302-082302
Main Authors: Adler, C, Ahammed, Z, Allgower, C, Amonett, J, Anderson, B D, Anderson, M, Averichev, G S, Balewski, J, Barannikova, O, Barnby, L S, Baudot, J, Bekele, S, Belaga, V V, Bellwied, R, Berger, J, Bichsel, H, Billmeier, A, Bland, L C, Blyth, C O, Bonner, B E, Boucham, A, Brandin, A, Bravar, A, Cadman, R V, Caines, H, Calderón de la Barca Sánchez, M, Cardenas, A, Carroll, J, Castillo, J, Castro, M, Cebra, D, Chaloupka, P, Chattopadhyay, S, Chen, Y, Chernenko, S P, Cherney, M, Chikanian, A, Choi, B, Christie, W, Coffin, J P, Cormier, T M, Corral, M M, Cramer, J G, Crawford, H J, Derevschikov, A A, Didenko, L, Dietel, T, Draper, J E, Dunin, V B, Dunlop, J C, Eckardt, V, Efimov, L G, Emelianov, V, Engelage, J, Eppley, G, Erazmus, B, Fachini, P, Faine, V, Faivre, J, Fatemi, R, Filimonov, K, Finch, E, Fisyak, Y, Flierl, D, Foley, K J, Fu, J, Gagliardi, C A, Gagunashvili, N, Gans, J, Gaudichet, L, Germain, M, Geurts, F, Ghazikhanian, V, Grachov, O, Grigoriev, V, Guedon, M, Gushin, E, Hallman, T J, Hardtke, D, Harris, J W, Henry, T W, Heppelmann, S, Herston, T, Hippolyte, B, Hirsch, A, Hjort, E, Hoffmann, G W, Horsley, M, Huang, H Z, Humanic, T J, Igo, G, Ishihara, A, Ivanshin, Yu I, Jacobs, P, Jacobs, W W, Janik, M, Johnson, I, Jones, P G, Judd, E G, Kaneta, M
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Language:English
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Summary:Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudorapidity range and full azimuth in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV. The small-angle correlations observed in p+p collisions and at all centralities of Au+Au collisions are characteristic of hard-scattering processes previously observed in high-energy collisions. A strong back-to-back correlation exists for p+p and peripheral Au+Au. In contrast, the back-to-back correlations are reduced considerably in the most central Au+Au collisions, indicating substantial interaction as the hard-scattered partons or their fragmentation products traverse the medium.
ISSN:0031-9007