Drell–Yan as a probe of small x partons at the LHC
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The predictions of Drell–Yan production of low-mass lepton pairs, at high rapidity at the LHC, are known to depend sensitively on the choice of factorization and renormalization scales. We show how this sensitivity can be greatly reduced by fixing the factorization scale of the LO contribution based on the known NLO matrix element, so that observations of this process at the LHC can make direct measurements of parton distribution functions in the low x domain; x≲10−4.
KeywordsMomentum Fraction DGLAP Evolution NNLO Contribution Hard Matrix Element Renormalization Scale Ambiguity
We thank Ronan McNulty for useful discussions. EGdO and MGR thank the IPPP at the University of Durham for hospitality. This work was supported by the grant RFBR 11-02-00120-a and by the Federal Program of the Russian State RSGSS-65751.2010.2; and by FAPESP (Brazil) under contract 2011/50597-8.