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Charge Symmetry Breaking in Parton Distribution Functions from Lattice QCD

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arxiv 1012.0215 v2 pith:7QEQCXYX submitted 2010-12-01 hep-lat hep-phnucl-th

Charge Symmetry Breaking in Parton Distribution Functions from Lattice QCD

R. Horsley , Y. Nakamura , D. Pleiter , P.E.L. Rakow , G. Schierholz , H. St\"uben , A.W. Thomas , F. Winter
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R.D. Young J.M. Zanotti
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classification hep-lat hep-phnucl-th
keywords chargedistributionfunctionspartonsymmetryviolationaccuracylattice
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By determining the quark momentum fractions of the octet baryons from N_f=2+1 lattice simulations, we are able to predict the degree of charge symmetry violation in the parton distribution functions of the nucleon. This is of importance, not only as a probe of our understanding of the non-perturbative structure of the proton but also because such a violation constrains the accuracy of global fits to parton distribution functions and hence the accuracy with which, for example, cross sections at the LHC can be predicted. A violation of charge symmetry may also be critical in cases where symmetries are used to guide the search for physics beyond the Standard Model.

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