arXiv 1902.073982019-02hep-phhep-exnucl-exnucl-th

形状因子不确定性对相干弹性中微子-核散射数据解释的影响

Impact of form factor uncertainties on interpretations of coherent elastic neutrino-nucleus scattering data

D. Aristizabal Sierra, Jiajun Liao, D. Marfatia

备注：: 13 pages, 7 figures, 1 table. Version to appear in JHEP
发表信息：: JHEP 1906:141 (2019)
DOI：: 10.1007/JHEP06(2019)141

摘要：

标准模型相干弹性中微子-核散射截面（CE $ν$ NS）受核形状因子不确定性的影响，主要由中子密度分布的均方根半径驱动.出于一致性阶段I-III和未来的多吨直接探测暗物质搜索，我们评估碘化铯，锗，氙和氩探测器的这些不确定性。我们发现，动量转移$q\gtrsim 20$兆电子伏的不确定性变得相关，基本上是独立的形状因子参数化。因此，形状因子的不确定性是不重要的CE $ν$ NS反应堆或太阳中微子诱导。考虑到这些不确定性，我们然后评估它们的测量CE $ν$ NS在COHERENT，扩散超新星背景（DSNB）中微子和亚GeV大气中微子的影响。我们还计算了作为反冲能函数的不同核的相干事件数的相对不确定度。对于DSNB和大气中微子，液氩探测器的事件率可以不确定到5%以上。最后，我们考虑了形状因子的不确定性对非标准中微子相互作用、不育中微子和广义中微子相互作用的影响。我们指出，使用CE $ν$ NS数据的新物理的研究受到中子形状因子的不确定性，如果不适当地考虑，可能会导致新的物理信号的错误识别。这里量化的不确定性也与暗物质直接探测搜索有关。

英文摘要：

The standard model coherent elastic neutrino-nucleus scattering (CE$ν$NS) cross section is subject to nuclear form factor uncertainties, mainly driven by the root-mean-square radius of the neutron density distribution. Motivated by COHERENT phases I-III and future multi-ton direct detection dark matter searches, we evaluate these uncertainties in cesium iodide, germanium, xenon and argon detectors. We find that the uncertainties become relevant for momentum transfers $q\gtrsim 20$ MeV and are essentially independent of the form factor parameterization. Consequently, form factor uncertainties are not important for CE$ν$NS induced by reactor or solar neutrinos. Taking into account these uncertainties, we then evaluate their impact on measurements of CE$ν$NS at COHERENT, the diffuse supernova background (DSNB) neutrinos and sub-GeV atmospheric neutrinos. We also calculate the relative uncertainties in the number of COHERENT events for different nuclei as a function of recoil energy. For DSNB and atmospheric neutrinos, event rates at a liquid argon detector can be uncertain to more than 5%. Finally, we consider the impact of form factor uncertainties on searches for nonstandard neutrino interactions, sterile neutrinos and neutrino generalized interactions. We point out that studies of new physics using CE$ν$NS data are affected by neutron form factor uncertainties, which if not properly taken into account may lead to the misidentification of new physics signals. The uncertainties quantified here are also relevant for dark matter direct detection searches.

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摘要：

英文摘要：

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