Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations

Charged-particle spectra associated with direct photon ({gamma}{sub dir}) and {pi}{sup 0} are measured in p+p and Au+Au collisions at center-of-mass energy {radical}(s{sub N{sub N}})=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially d...

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Veröffentlicht in:	Physical review. C, Nuclear physics Nuclear physics, 2010-09, Vol.82 (3), Article 034909
Hauptverfasser:	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., Calderón de la Barca Sánchez, M., 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., Derradi de Souza, R., Didenko, L., Djawotho, P., Dogra, S. M., Dong, X., Drachenberg, J. L., Draper, J. E., Dunlop, J. C., Dutta Mazumdar, M. R., 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:	Artikel
Sprache:	eng
Schlagworte:	ACCELERATORS ATOM COLLISIONS ATOM-ATOM COLLISIONS BARYON-BARYON INTERACTIONS BOSONS BROOKHAVEN RHIC CENTER-OF-MASS SYSTEM CHARGED PARTICLES COLLISIONS COLOR MODEL COMPOSITE MODELS CORRELATIONS ELEMENTARY PARTICLES ELEMENTS ENERGY LOSSES ENERGY RANGE FRAGMENTATION GEV RANGE GEV RANGE 100-1000 GOLD HADRON-HADRON INTERACTIONS HADRONS HEAVY ION ACCELERATORS HEAVY ION REACTIONS High Energy Physics - Experiment INTERACTIONS LINEAR MOMENTUM LOSSES MASSLESS PARTICLES MATHEMATICAL MODELS MESONS METALS NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEON-NUCLEON INTERACTIONS PARTICLE INTERACTIONS PARTICLE MODELS PHOTONS Physics PIONS PIONS NEUTRAL PROTON-NUCLEON INTERACTIONS PROTON-PROTON INTERACTIONS PSEUDOSCALAR MESONS QUARK MODEL SENSITIVITY SPECTRA STORAGE RINGS TRANSITION ELEMENTS TRANSVERSE MOMENTUM
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Zusammenfassung:	Charged-particle spectra associated with direct photon ({gamma}{sub dir}) and {pi}{sup 0} are measured in p+p and Au+Au collisions at center-of-mass energy {radical}(s{sub N{sub N}})=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially discriminate between {gamma}{sub dir} and {pi}{sup 0}. Assuming no associated charged particles in the {gamma}{sub dir} direction (near side) and small contribution from fragmentation photons ({gamma}{sub frag}), the associated charged-particle yields opposite to {gamma}{sub dir} (away side) are extracted. In central Au+Au collisions, the charged-particle yields at midrapidity (\|{eta}\|
ISSN:	0556-2813 2470-0010 1089-490X 2470-0029
DOI:	10.1103/PhysRevC.82.034909