Nuclear broadening effects on hard prompt photons at relativistic 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 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.
| Author: | Adrian Bogdan DumitruORCiDGND, Leonid Frankfurt, Lars GerlandGND, Horst StöckerORCiDGND, Mark StrikmanORCiDGND |
|---|---|
| URN: | urn:nbn:de:hebis:30-21471 |
| Document Type: | Preprint |
| Language: | English |
| 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 (2001) 054909 - [hep-ph/0103203] Version 2 |
| HeBIS-PPN: | 185535550 |
| Institutes: | Physik / Physik |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Licence (German): |  Deutsches Urheberrecht |
