Reassessment of the NuTeV determination of the weak mixing angle

In light of the recent discovery of the importance of the isovector EMC effect for the interpretation of the NuTeV determination of sin2θW, it seems timely to reassess the central value and the errors on this fundamental Standard Model parameter derived from the NuTeV data. We also include earlier w...

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Bibliographic Details
Published in:Physics letters. B 2010-10, Vol.693 (4), p.462-466
Main Authors: Bentz, W., Cloët, I.C., Londergan, J.T., Thomas, A.W.
Format: Article
Language:English
Subjects:
Asymmetry
Charge
Charge symmetry
Cross sections
Elementary particles
Exact sciences and technology
Mathematical models
Neutrino deep inelastic scattering
Nuclear physics
NuTeV
Physics
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Standard deviation
Strange quark asymmetry
The physics of elementary particles and fields
Weak mixing angle
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Summary:In light of the recent discovery of the importance of the isovector EMC effect for the interpretation of the NuTeV determination of sin2θW, it seems timely to reassess the central value and the errors on this fundamental Standard Model parameter derived from the NuTeV data. We also include earlier work on charge symmetry violation and the recent limits on a possible asymmetry between s and s¯ quarks. With these corrections we find a revised NuTeV result of sin2θW=0.2221±0.0013(stat)±0.0020(syst), which is in excellent agreement with the running of sin2θW predicted by the Standard Model. As a further check, we find that the separate ratios of neutral current to charge current cross-sections for neutrinos and for antineutrinos are both in agreement with the Standard Model, at just over one standard deviation, once the corrections described here are applied.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2010.09.001