We study the impact of differential isolated-photon + jet cross sections measured in proton-proton collisions at a center-of-mass energy of root s = 7 TeV 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 gamma-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.

Sensitivity of the LHC isolated-γ + jet data to the parton distribution functions of the proton / L. Carminati, G. Costa, D. D'Enterria, I. Koletsou, G. Marchiori, J. Rojo, M. Stockton, F. Tartarelli. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 101:6(2013), pp. 61002.1-61002.6. [10.1209/0295-5075/101/61002]

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

L. Carminati;J. Rojo;F. Tartarelli
2013

Abstract

We study the impact of differential isolated-photon + jet cross sections measured in proton-proton collisions at a center-of-mass energy of root s = 7 TeV 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 gamma-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.
High Energy Physics - Phenomenology; High Energy Physics - Phenomenology; High Energy Physics - Experiment
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/869380
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