Measuring gluon shadowing with prompt photons at RHIC and LHC

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dc.creatorArleo, Francois
dc.creatorGousset, Thierry
dc.date2007-07-19
dc.date2008-10-23
dc.date.accessioned2026-07-07T11:17:56Z
dc.date.available2026-07-07T11:17:56Z
dc.descriptionThe 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.
dc.description14 pages, 6 figures. Typo corrected in Eq. (4)
dc.identifierhttps://arxiv.org/abs/0707.2944
dc.identifierhttp://arxiv.org/abs/0707.2944
dc.identifierPhys.Lett.B660:181-187,2008
dc.identifierdoi:10.1016/j.physletb.2007.12.025
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193178
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMeasuring gluon shadowing with prompt photons at RHIC and LHC
dc.typetext

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