Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-19
Phys.Lett.B660:181-187,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 6 figures. Typo corrected in Eq. (4)
Scientific paper
10.1016/j.physletb.2007.12.025
The possibility to observe the nuclear modification of the gluon distribution at small-x (gluon shadowing) using high-p_T prompt photon production at RHIC and at LHC is discussed. The per-nucleon ratio, sigma(p+A -> gamma+X) / A sigma(p+p -> gamma+X), is computed for both inclusive and isolated prompt photons in perturbative QCD at NLO using different parametrizations of nuclear parton densities, in order to assess the visibility of the shadowing signal. The production of isolated photons turns out to be a promising channel which allows for a reliable extraction of the gluon density, G^A/G^p, and the structure function, F_2^A/F_2^p, in a nucleus over that in a proton. Moreover, the production ratio of prompt photons at forward-over-backward rapidity in p-A collisions provides an estimate of G^A/G^p (at small x) over F_2^A/F_2^p (at large x), without the need of p-p reference data at the same energy.
Arleo François
Gousset Thierry
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