2009/10/27 by Kwangwoo Park, Park, Kwangwoo, Ulrich Baur +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.0910.5013
To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726 A few typos corrected and one reference added in this version
arxiv created 2009/11/02 · arxiv updated 2009/12/01
A dedicated effort by both the experimental and theoretical communities is crucial for achieving a precise determination of Standard Model parameters such as the W mass (MW). MW is measured directly at the CERN LEP2 e+ e- and the Fermilab Tevatron p p colliders, resulting in a precision of δMW/MW=0.03%. A complementary MW measurement is provided by the NuTeV collaboration, who extract sin2 θW, and thus MW, from the ratio of deep-inelastic neutral and charged-current neutrino(anti-neutrino)-Nucleon (νN( νN)) scattering cross sections. However, their result differs from direct measurements performed at LEP2 and the Tevatron by about three standard deviations. Possible sources for the origin of this discrepancy have been extensively studied in the literature, among them the impact of electroweak radiative corrections. Here we provide first (preliminary) results of a new calculation of electroweak \cal O(α) corrections with emphasis on the effects of non-zero muon and charm quark masses. We find non-negligible shifts in sin2θW due to these mass effects but more detailed studies including detector resolution effects are needed to determine their impact on MW as extracted by the NuTeV collaboration.