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arXiv 0910.5013hep-ph
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NuTeV中微子-核子散射的电弱辐射修正

Electroweak radiative corrections to neutrino--nucleon scattering at NuTeV

Kwangwoo Park, Ulrich Baur, Doreen Wackeroth

备注：
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
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摘要：

实验界和理论界的共同努力对于精确确定标准模型参数，如$W$质量（$M_W$）至关重要。$M_W$直接在CERN LEP 2 $e^+ e^-$和Fermilab Tevatron $p \bar p$对撞机上测量，精度为$δM_W/M_W=0.03%$。NuTeV合作提供了一个补充的$M_W$测量，他们从深度非弹性中性和带电电流中微子（反中微子）-核子（$νN(\bar νN)$）散射截面的比率中提取$\sin^2 θ_W$，从而提取$M_W$。然而，他们的结果与LEP 2和Tevatron进行的直接测量相差约三个标准差。这种差异的起源的可能来源已在文献中进行了广泛的研究，其中包括电弱辐射校正的影响。在这里，我们提供了第一个（初步）的结果，电弱${\cal O}(α)$修正的一个新的计算，强调非零μ子和魅力夸克质量的影响。我们发现，由于这些质量效应，$\sin^2θ_W$的变化不可忽略，但需要更详细的研究，包括探测器分辨率的影响，以确定其对$M_W$的影响，提取的NuTeV合作。

英文摘要：

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 ($M_W$). $M_W$ is measured directly at the CERN LEP2 $e^+ e^-$ and the Fermilab Tevatron $p \bar p$ colliders, resulting in a precision of $δM_W/M_W=0.03%$. A complementary $M_W$ measurement is provided by the NuTeV collaboration, who extract $\sin^2 θ_W$, and thus $M_W$, from the ratio of deep-inelastic neutral and charged-current neutrino(anti-neutrino)-Nucleon ($νN(\bar νN)$) 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 $\sin^2θ_W$ due to these mass effects but more detailed studies including detector resolution effects are needed to determine their impact on $M_W$ as extracted by the NuTeV collaboration.

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