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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 less than about 10^{-4}.
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How to include exclusive $J/\psi$ production data in global PDF analyses
Exclusive J/psi photoproduction at HERA is consistent with global PDFs at NLO when the optimal scale and a Q0 subtraction are used, enabling low-x gluon extraction.
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