Towards an unbiased determination of parton distributions with QED corrections

Abstract

Electroweak corrections to hadron collider processes become relevant at the level of precision reached by present-day LHC experiments. We provide a preliminary discussion of the impact of electroweak corrections to parton distributions, concentrating on electrodynamics corrections to parton evolution equations, and showing a preliminary assessment of their impact. Furthermore, we determine the parton distribution function of the photon from deep inelastic scattering data using the NNPDF methodology.

Comments: 4 pages, 7 figures, to appear in the proceedings of 48th Rencontres de Moriond, QCD and High Energy Interactions, La Thuile, Italy, March 2013; updated 68% c.l. bands on figures 3 and 4, results unchanged