Volume 101, Number 6, March 2013
|Number of page(s)||6|
|Section||The Physics of Elementary Particles and Fields|
|Published online||03 April 2013|
Sensitivity of the LHC isolated-γ + jet data to the parton distribution functions of the proton
1 INFN Sezione di Milano - Milano, Italy
2 Dipartiemento di Fisica, Università di Milano - Milano, Italy
3 CERN, PH Department - CH-1211 Geneva 23, Switzerland
4 LPNHE, Univ. Pierre et Marie Curie - Univ. Paris-Diderot - CNRS/IN2P3 - Paris, France
5 CERN, PH Department, TH Unit - CH-1211 Geneva 23, Switzerland
6 Department of Physics, McGill University-Montreal, Quebec, Canada
Received: 11 January 2013
Accepted: 5 March 2013
We study the impact of differential isolated-photon + jet cross sections measured in proton-proton collisions at a center-of-mass energy of 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.
PACS: 12.38.Bx – Perturbative calculations / 14.70.Bh – Photons / 13.87.Ce – Production
© EPLA, 2013
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