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Precise Determination of Electroweak Parameters in NeutrinoNucleon Scattering
Shadowing Corrections and the Precise Determination of Electroweak
Parameters in Neutrino-Nucleon Scattering
Gerald A. Miller
University of Washington Seattle, WA 98195-1560
A. W. Thomas
Department of Physics and Mathematical Physics, and Special Research Centre for the
Subatomic Structure of Matter
Univ. of Adelaide, Adelaide 5005, Australia
4
0
0 2
2 A systematic error in the extraction of sin θW from nuclear deep inelastic scat-
l tering of neutrinos and antineutrinos arises from higher-twist effects arising from
u nuclear shadowing. We explain that these effects cause a correction to the results
J
9 of the recently reported significant deviation from the Standard Model that is po-
tentially as large as the deviation claimed, and of a sign that cannot be determined
3 without an extremely careful study of the data set used to model the input parton
v
7 distribution functions.
0 In a recent and stimulating paper [1], the NuTeV collaboration reported a determination of
0 2
4 sin θW , based on a comparison of charged and neutral current neutrino interactions with a nuclear
0 target (Fe), which differs from the Standard Model prediction by three standard deviations. In view
2
0 of the importance of such a result it is vital that the sources of systematic error be clearly identified
/ and examined. Here we explain
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