Nuclear broadening effects on hard prompt photons at CERN-SPS and BNL-RHIC energies

  • 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 effects, 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 e ects 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.
  • Korrigierte Version unter dem Titel: Dumitru, Adrian ; Frankfurt, Leonid ; Gerland, Lars ; Stöcker, Horst ; Strikman, Mark : Nuclear broadening effects on hard prompt photons at relativistic energies

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Author:Adrian Bogdan DumitruORCiDGND, Leonid Frankfurt, Lars GerlandGND, Horst StöckerORCiDGND, Mark StrikmanORCiDGND
Document Type:Preprint
Date of Publication (online):2005/11/17
Year of first Publication:2001
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/11/17
Tag:nuclear broadening effect; prompt photon
Source:Phys.Rev.C64:054909,2001. [hep-ph/0103203],
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht