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arXiv 0812.4543hep-ex
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NOMAD实验中准弹性μ介子中微子和反中微子散射的研究

A study of quasi-elastic muon neutrino and antineutrino scattering in the NOMAD experiment

NOMAD Collaboration, V. Lyubushkin

备注：
26 pages, 18 figures, submitted to Eur.Phys.J.C
发表信息：
Eur.Phys.J.C63:355-381,2009
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摘要：

利用NOMAD合作组收集的实验数据，研究了μ子中微子和反中微子准弹性散射反应（$ν_μn\to μ^- p$和$\barν_μp\to μ^+ n$）.我们已经进行了测量的核目标（主要是碳）的这些过程的横截面归一化到总$ν_μ$（$\barν_μ$）充电电流截面。在（反）中微子能量区间3-100 GeV，通量平均QEL截面的结果分别为中微子的$σ^{qel}_{ν_μ} = (0.92 \pm 0.02 (stat) \pm 0.06 (syst))\times 10^{-38} \cm^2$和反中微子的$σ{qel}_{\barν_μ} = (0.81 \pm 0.05 (stat) \pm 0.08 (syst))\times 10^{-38} \cm^2$。轴向质量参数$M_A$是从测量的准弹性中微子截面中提取的。相应的结果是$M_A = 1.05 \pm 0.02 (stat) \pm 0.06 (syst) GeV$。它与由反中微子截面重新计算的轴向质量值和由$ν_μ$准弹性双径迹事例的高纯样品的纯$Q^2$形状分析提取的轴向质量值是一致的，但系统误差较小，应作为本工作的主要结果引用。我们测得的$M_A$被发现是在良好的协议与世界平均值在以前的氘填充气泡室实验中获得。$M_A$的NOMAD测量值低于最近由K2 K和MiniBooNE合作发表的测量值。然而，在$M_A$上的这些实验所引用的大误差内，这些结果与更精确的NOMAD值相容。

英文摘要：

We have studied the muon neutrino and antineutrino quasi-elastic (QEL) scattering reactions ($ν_μn\to μ^- p$ and $\barν_μp\to μ^+ n$) using a set of experimental data collected by the NOMAD collaboration. We have performed measurements of the cross-section of these processes on a nuclear target (mainly Carbon) normalizing it to the total $ν_μ$ ($\barν_μ$) charged current cross-section. The results for the flux averaged QEL cross-sections in the (anti)neutrino energy interval 3-100 GeV are $σ^{qel}_{ν_μ} = (0.92 \pm 0.02 (stat) \pm 0.06 (syst))\times 10^{-38} \cm^2$ and $σ{qel}_{\barν_μ} = (0.81 \pm 0.05 (stat) \pm 0.08 (syst))\times 10^{-38} \cm^2$ for neutrino and antineutrino, respectively. The axial mass parameter $M_A$ was extracted from the measured quasi-elastic neutrino cross-section. The corresponding result is $M_A = 1.05 \pm 0.02 (stat) \pm 0.06 (syst) GeV$. It is consistent with the axial mass values recalculated from the antineutrino cross-section and extracted from the pure $Q^2$ shape analysis of the high purity sample of $ν_μ$ quasi-elastic 2-track events, but has smaller systematic error and should be quoted as the main result of this work. Our measured $M_A$ is found to be in good agreement with the world average value obtained in previous deuterium filled bubble chamber experiments. The NOMAD measurement of $M_A$ is lower than those recently published by K2K and MiniBooNE collaborations. However, within the large errors quoted by these experiments on $M_A$, these results are compatible with the more precise NOMAD value.

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