TY  - INPR
A1  - Dumitru, Adrian Bogdan
A1  - Frankfurt, Leonid
A1  - Gerland, Lars
A1  - Stöcker, Horst
A1  - Strikman, Mark
T1  - Nuclear broadening effects on hard prompt photons at relativistic energies
N2  - We calculate prompt photon production in high-energy nuclear collisions. We focus on the broadening of the intrinsic transverse momenta of the partons in the initial state from nuclear e ects, and their influence on the prompt photon pt distribution. Comparing to WA98 data from Pb+Pb collisions at s = 17.4A GeV we find evidence for the presence of nuclear broadening at high pt in this hard process. Below pt < 2.7 GeV the photon distribution is due to small momentum transfer processes. At RHIC energy, s = 200A GeV, the e ect of intrinsic transverse momentum on the spectrum of prompt photons is less prominent. The region pt = 3 4 GeV would be the most promising for studying the nuclear broadening effects at that energy. Below pt = 2 3 GeV the contribution from large momentum transfers flattens out, and we expect that region to be dominated by soft contributions.
KW  - nuclear broadening effect
KW  - prompt photon
Y1  - 2001
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3261
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-21471
ER  -