Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at s NN = 200 GeV: Jet quenching and the response of partonic matter

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2008-01, Vol.77 (1), Article 011901
• Main Authors: Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Alexander, J., Al-Jamel, A., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bickley, A. A., Bjorndal, M. T., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Campbell, S., Chai, J.-S., Chang, B. S., Charvet, J.-L., Chernichenko, S., Chiba, J., Chi, C. Y., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., Constantin, P., Csanád, M., Csörgő, T., Dahms, T., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d’Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Donadelli, M., Drachenberg, J. L., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En’yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fields, D. E., Finger, M., Jr, M. Finger, Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z.
• Format: Article
• Language: English
• Subjects: DISTRIBUTION; HADRONS; JETS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QUENCHING; SHAPE; TRANSVERSE MOMENTUM
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.77.011901

Azimuthal angle {Delta}{phi} correlations are presented for charged hadrons from dijets for 0.4 < p{sub T} < 10 GeV/c in Au+Au collisions at {radical}(s{sub NN}) = 200 GeV. With increasing p{sub T}, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed 'head' region centered at {Delta}{phi} {approx} {pi}, and an enhanced 'shoulder' region centered at {Delta}{phi} {approx} {pi} {+-} 1.1. The p{sub T} spectrum for the 'head' region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the 'shoulder' region is independent of centrality and trigger p{sub T}, which offers constraints on energy transport mechanisms and suggests that the 'shoulder' region contains the medium response to energetic jets.