Constraints on the proton's gluon distribution from prompt photon production
نویسندگان
چکیده
منابع مشابه
Constraints on the Proton’s Gluon Distribution from Prompt Photon Production
We analyze the capability of prompt photon production in pp and pp̄ collisions to constrain the gluon distribution of the proton, considering data from fixed-target experiments as well as collider measurements. Combined fits are performed to these large-pT direct-γ cross sections and lepton-proton deep-inelastic scattering data in the framework of nextto-leading order perturbative QCD. Special a...
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Constraint of prompt photon data on the polarized gluon distribution is discussed in terms of uncertainty estimation for polarized parton distribution functions (PDFs). By comparing between uncertainty of the double spin asymmetry AγLL and expected statistical errors at RHIC, we found that the gluon distribution is effectively constrained in the region 0.04 < x T < 0.2 with the data at transver...
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We calculate the cross section for inclusive prompt photon production in γγ collisions, i.e. the reaction ee → γγ → γX, in next-to-leading order QCD. We show that at LEP2 energies this cross section is measurable and is sensitive to the gluon distribution of the photon, g , which is currently very poorly constrained by data. Typeset using REVTEX 1
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The utility of prompt photon plus associated jet production for constraining the size and shape of the polarized gluon density of the proton ∆G is examined at √ S = 40 GeV, appropriate for the proposed HERA-N polarized p p collider experiment. The calculation is performed at next-to-leading order (O(αα 2 s)) in QCD. The reliability of the predictions are examined in some detail.
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In-medium interactions of a particle in a hot plasma are considered in the framework of thermal field theory. The formalism to calculate gauge invariant rates for photon and dilepton production from the medium is given. In the application to a QED plasma, astrophysical consequences are pointed out. The photon production rate from strongly interacting quarks in the quark–gluon plasma, which migh...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1995
ISSN: 0550-3213
DOI: 10.1016/0550-3213(95)00424-q