A New Analysis of Charge Symmetry Violation in Parton Distributions

Details A New Analysis of Charge Symmetry Violation in Parton Distributions A New Analysis of Charge Symmetry Violation in Parton Distributions

1999-08-06

arxiv.org/abs/hep-ph/9908280v1

Phys.Lett.B468:161-167,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 4 figures

Scientific paper

10.1016/S0370-2693(99)01154-5

To date, the strongest indication of charge symmetry violation in parton distributions has been obtained by comparing the $F_2$ structure functions from CCFR neutrino data and NMC muon data. We show that in order to make precise tests of charge symmetry with the neutrino data, two conditions must be satisfied. First, the nuclear shadowing calculations must be made explicitly for neutrinos, not simply taken from muon data on nuclei. Second, the contribution of strange and charm quarks should be calculated explicitly using next-to-leading order [NLO] QCD, and the ``slow rescaling'' charm threshold correction should not be applied to the neutrino data. When these criteria are satisfied, the comparison is consistent with charge symmetry within the experimental errors and the present uncertainty in the strange quark distribution of the nucleon.

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