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arXiv 1106.0976hep-phnucl-th
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中微子在~（12）C上的中性流弹性散射

Neutrino neutral-current elastic scattering on 12C

A. V. Butkevich, D. Perevalov

备注：
23 pages, 8 figures
发表信息：
Phys.Rev.C84:015501,2011
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摘要：

采用相对论扭曲波冲量近似和相对论光学势，计算了中微子在碳和$CH_2$靶上的中性流弹性散射。给出了中微子在${}^{12}$ C靶上的排斥反应和包容反应的结果。研究表明，在中微子中性流和带电流准弹性散射中，核效应对四动量转移平方分布$dσ/dQ^2_{QE}$形状的影响是相似的。我们还计算了中微子从$CH_2$散射的通量平均中性流弹性微分截面$dσ/dQ^2_{QE}$，以及中性流与带电流截面之比作为$Q^2_{QE}$的函数.轴向质量$M_A$的值是从MiniBooNE实验中测量的$dσ/dQ^2_{QE}$横截面的拟合中提取的。提取的$M_A=1.28\pm 0.05$ GeV值在误差范围内与MiniBooNE结果一致。此外，对于切伦科夫阈值以上的质子动能，奇怪的夸克贡献的中性流轴向矢量形状因子在$Q^2_{QE}=0$，$Δs$，提取从拟合的MiniBoone数据$νp \to νp$，$νN \to νN$截面比。发现该值为$Δs=-0.11\pm 0.36$

英文摘要：

The neutral current elastic scattering of neutrinos on Carbon and $CH_2$ targets is computed using the relativistic distorted-wave impulse approximation with relativistic optical potential. Results for exclusive and inclusive neutrino reactions on ${}^{12}$C target are presented. We show that the nuclear effects on the shape of four-momentum transferred squared distribution $dσ/dQ^2_{QE}$ in neutrino neutral-current and charged-current quasi-elastic scattering are similar. We also calculate flux-averaged neutral current elastic differential cross section $dσ/dQ^2_{QE}$ for neutrino scattering from $CH_2$, as well as, the neutral-current to charged-current cross section ratio as functions of $Q^2_{QE}$. The value of axial mass $M_A$ is extracted from a fit of $dσ/dQ^2_{QE}$ cross section measured in MiniBooNE experiment. The extracted value of $M_A=1.28\pm 0.05$ GeV is consistent within errors with the MiniBooNE result. Additionally, for proton kinetic energies above the Cherenkov threshold, the strange quark contribution to the neutral current axial vector form factor at $Q^2_{QE}=0$, $Δs$, was extracted from a fit of MiniBoone data for $νp \to νp$ to $νN \to νN$ cross section ratio. This value is found to be $Δs=-0.11\pm 0.36$

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