Communication Dans Un Congrès Année : 2008

Probing gluon shadowing with forward photons at RHIC

Résumé

There is a major need to better constrain nuclear parton densities in order to provide reliable perturbative QCD predictions at the LHC as well as to probe possible non-linear evolution at small values of x. In these proceedings, we discuss how the production of prompt photons at large rapidity in p-p and d-Au collisions at RHIC (sqrt(s_NN)=200 GeV) is sensitive to the nuclear modifications of gluon distributions at x~0.001 and at rather low scales, Q^2~10 GeV^2. The nuclear production ratio, R_dAu=sigma(d+A->gamma+X)/(2A sigma(p+p->gamma X), is computed for isolated prompt photons at NLO using the nDSg nuclear parton densities, in order to assess the visibility of the signal. We also emphasise that the expected counting rates in a year of running at RHIC are large, indicating that R_dAu could be measured with a high statistical accuracy.

Dates et versions

in2p3-00285304 , version 1 (05-06-2008)

Identifiants

  • HAL Id : in2p3-00285304 , version 1
  • ARXIV : 0806.0769

Citer

F. Arleo, Thierry Gousset. Probing gluon shadowing with forward photons at RHIC. 20th International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (Quark Matter 2008), Feb 2008, Jaipur, India. ⟨in2p3-00285304⟩
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