Long range rapidity correlations and jet production in high energy nuclear collisions

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2009-12, Vol.80 (6), Article 064912
• Main Authors: 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., Baudot, J., 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., Bombara, M., Bonner, B. E., Bouchet, J., Braidot, E., Brandin, A. V., Bruna, E., Bueltmann, S., Burton, T. P., Bystersky, M., Cai, X. Z., Caines, H., Sánchez, M. Calderón de la Barca, 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., 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., de Souza, R. Derradi, Didenko, L., Djawotho, P., Dogra, S. M., Dong, X., Drachenberg, J. L., Draper, J. E., Dunlop, J. C., Mazumdar, M. R. Dutta, 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., Gaillard, L., Gangadharan, D. R., Ganti, M. S., Garcia-Solis, E. J., Geromitsos, A., Geurts, F., Ghazikhanian, V., Ghosh, P.
• Format: Article
• Language: English
• Subjects: ATOMIC AND MOLECULAR PHYSICS; DISTRIBUTION; HADRONS; HEAVY IONS; ION COLLISIONS; PARTICLE PRODUCTION; PARTICLE RAPIDITY; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PRODUCTION; SHAPE; TRANSVERSE MOMENTUM
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.80.064912

The STAR Collaboration at the Relativistic Heavy Ion Collider presents a systematic study of high-transverse-momentum charged-di-hadron correlations at small azimuthal pair separation {Delta}{phi} in d+Au and central Au+Au collisions at {radical}s{sub NN} = 200 GeV. Significant correlated yield for pairs with large longitudinal separation {Delta}{eta} is observed in central Au+Au collisions, in contrast to d+Au collisions. The associated yield distribution in {Delta}{eta} x {Delta}{phi} can be decomposed into a narrow jet-like peak at small angular separation which has a similar shape to that found in d+Au collisions, and a component that is narrow in {Delta}{phi} and depends only weakly on {Delta}{eta}, the 'ridge.' Using two systematically independent determinations of the background normalization and shape, finite ridge yield is found to persist for trigger p{sub t} > 6 GeV/c, indicating that it is correlated with jet production. The transverse-momentum spectrum of hadrons comprising the ridge is found to be similar to that of bulk particle production in the measured range (2 < p{sub t} < 4 GeV/c).