Rezaeian, Amir H. and Schaefer, Andreas (2010) Hadrons and direct photon production in pp and pA collisions at the LHC and saturation effects. PHYSICAL REVIEW D, 81 (11): 114032. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
We investigate hadrons and direct photon production in pp and pA collisions at the energies of RHIC and LHC within the color-dipole approach employing various saturation models. We show that greatest sensitivity to saturation effects is reached at very forward rapidities for pp collisions at LHC (root s = 14 TeV). The ratio of direct-photon to pion gamma/pi(0) production can be about 20 divided by 10 (at eta = 7 divided by 8). Therefore, direct photon production at forward rapidities should provide a rather clean probe. We calculate the rapidity dependence of the invariant cross section and find some peculiar enhancement at forward rapidities which is more pronounced for direct photon production. We show that this peak is further enhanced by saturation effects. We provide predictions for the nuclear modification factor R-pA for pions and direct photon production in pA collisions at LHC energy at midrapidity. We show within various saturation models that the pion Cronin enhancement at RHIC is replaced by a moderate suppression at LHC energy at midrapidity due to gluon shadowing effects. Cronin enhancement of direct photons can survive at LHC energy within models with a larger saturation scale.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COLOR GLASS CONDENSATE; GLUON DISTRIBUTION-FUNCTIONS; NUCLEUS-NUCLEUS COLLISIONS; WEIZSACKER-WILLIAMS FIELD; LARGE TRANSVERSE-MOMENTUM; DEUTERON-GOLD COLLISIONS; HIGH-ENERGY SCATTERING; HIGH-DENSITY QCD; SMALL-X; PARTON DISTRIBUTIONS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jul 2020 06:35 |
| Last Modified: | 28 Jul 2020 06:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24551 |
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