Systematic study of real photon and Drell-Yan pair production in p+A (d+A) interactions - INSPIRE

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Systematic study of real photon and Drell-Yan pair production in p+A (d+A) interactions

M. Krelina
(
- Prague, Tech. U.
)
,
E. Basso
(
- Rio de Janeiro Federal U. and
- Lund U., Dept. Theor. Phys.
)
,
V.P. Goncalves
(
- Lund U., Dept. Theor. Phys. and
- Pelotas U.
)
,
J. Nemchik
(
- Prague, Tech. U. and
- Kosice, IEF
)
,
R. Pasechnik
(
- Lund U., Dept. Theor. Phys.
)

Jul 4, 2016

6 pages

Part of Proceedings, 45th International Symposium on Multiparticle Dynamics (ISMD 2015) : Kreuth, Germany, October 4-9, 2015

Published in:

EPJ Web Conf. 120 (2016) 03006

Contribution to:

- ISMD 2015

Published: Jul 4, 2016

DOI:

10.1051/epjconf/201612003006

reference search2 citations

Citations per year

Abstract: (EDP Sciences)

We study nuclear effects in production of Drell-Yan pairs and direct photons in proton-nucleus collisions. For the first time, these effects are studied within the color dipole approach using the Green function formalism which naturally incorporates the color transparency and quantum coherence effects. The corresponding numerical results for the nuclear modification factor are compared with available data. Besides, we present a variety of predictions for the nuclear suppression as a function of transverse momentum p_T, Feynman variable x_F and invariant mass M of the lepton pair which can be verified by experiments at RHIC and LHC. We found that the nuclear suppression is caused predominantly by effects of quantum coherence (shadowing corrections) and by the effective energy loss induced by multiple initial state interactions. Whereas the former dominate at small Bjorken x_2 in the target, the latter turns out to be significant at large x_1 in the projectile beam and is universal at different energies and transverse momenta.

p nucleus: scattering
p nucleus: interaction
deuteron nucleus: scattering
deuteron nucleus: interaction
Drell-Yan process
photon: direct production
photon: transverse momentum
lepton: pair production
lepton: mass spectrum
coherence: effect

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