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arXiv 2409.01258hep-phhep-ex
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陶中微子出现测量中的深度非弹性散射截面不确定性

Deep Inelastic Scattering Cross Section Uncertainties in Tau Neutrino Appearance Measurements

Tetiana Kozynets, Thomas Stuttard, D. Jason Koskinen

AI总结:

本研究通过PDF计算陶中微子与μ中微子CC DIS截面比的不确定性,发现中微子能量高于5 GeV时不确定性小于3%,反中微子低能区可达2-30%,据此为大气与长基线实验中两种味截面不确定性的关联或独立处理提供了判据。

摘要:

在对多种味敏感的中微子实验中,分析者可能面临选择:是以关联方式还是非关联方式处理各味相应截面的不确定性。本研究聚焦于对μ子中微子和陶中微子均敏感的实验中的带电电流深度非弹性散射(CC DIS)道。我们计算了领头阶ν_τ与ν_μ截面的比值,并从底层部分子分布函数(PDFs)导出其不确定性。我们发现,对于能量高于5 GeV的中微子,PDF驱动的截面比不确定性小于3%,而在能量低于10 GeV的反中微子中可见更大(2-30%)的变化。这些结果表明,对于大气陶中微子出现分析,ν_τ与ν_μ DIS截面的不确定性应当耦合处理;而在采用反中微子束流的长基线实验中,对两种味分别处理可能是合理的。我们进一步探讨了定义DIS区域起始点的不变强子质量阈值的作用。我们认为,只有当该阈值同时应用于DIS截面和共振截面,并且考虑到与其他DIS及共振截面参数的相关性时,其影响才可被纳入。

英文摘要:

In neutrino experiments sensitive to multiple flavors, the analyzers may be presented with a choice of treating the uncertainties on the respective cross sections in a correlated or an uncorrelated manner. This study focuses on the charged current deep inelastic scattering (CC DIS) channel in experiments sensitive to both muon and tau neutrinos. We evaluate the ratio of the leading-order $ν_τ$ and $ν_μ$ cross sections and derive its uncertainty from the underlying parton distribution functions (PDFs). We find that, for neutrino energies above 5 GeV, the PDF-driven uncertainty on the cross section ratio is less than 3%, with a larger (2-30%) variation seen in antineutrinos at energies below 10 GeV. These results suggest that for atmospheric tau neutrino appearance analyses, the uncertainties in $ν_τ$ and $ν_μ$ DIS cross sections should be coupled, while separate treatment for the two flavors may be warranted in long-baseline experiments with an antineutrino beam. We further explore the role of the invariant hadronic mass threshold defining the onset of the DIS regime. We argue that its impact may be incorporated only if it is applied to both DIS and resonance cross sections, and if the correlations with other DIS and resonance cross section parameters are taken into account.

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