Sensitivity of the LHC isolated-γ + jet data to the parton distribution functions of the proton

Sensitivity of the LHC isolated-γ + jet data to the parton distribution functions of the proton

We study the impact of differential isolated-photon+jet cross sections measured in proton-proton collisions at a center-of-mass energy of √s= 7TeV on the parton distribution functions (PDF) of the proton. Next-to-leading-order perturbative QCD (pQCD) calculations complemented with the NNPDF2.1 parto...

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Príomhchruthaitheoirí: Carminati, L, Costa, G, D'Enterria, D, Koletsou, I, Marchiori, G, Rojo, J, Stockton, M, Tartarelli, F
Formáid: Journal article
Teanga:English
Foilsithe / Cruthaithe: 2013
Cur síos
Achoimre:We study the impact of differential isolated-photon+jet cross sections measured in proton-proton collisions at a center-of-mass energy of √s= 7TeV on the parton distribution functions (PDF) of the proton. Next-to-leading-order perturbative QCD (pQCD) calculations complemented with the NNPDF2.1 parton densities, and a Bayesian PDF reweighting method are employed. We find that although the current data provide only mild constraints to the parton densities, future γ-jet measurements with reduced experimental uncertainties can improve our knowledge of the gluon density over a wide range of parton fractional momenta x as well as of the quarks at low x. © EPLA, 2013.

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