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arXiv 1806.07424hep-phhep-ex
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中微子广义相互作用的COHERENT分析

COHERENT analysis of neutrino generalized interactions

D. Aristizabal Sierra, Valentina De Romeri, N. Rojas

备注：
24 pages, 8 figures, 2 tables. V2: Few references added
发表信息：
Phys. Rev. D 98, 075018 (2018)
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摘要：

有效的中微子-夸克广义相互作用完全由洛伦兹不变性决定，因此它们包含了所有可能的四费米子非导数洛伦兹结构。它们包含中微子-夸克非标准相互作用作为一个子集，但跨越一个更大的集合，涉及有效标量，赝标量，轴向和张量算子。利用最近的相干数据，我们推导出相应的耦合约束，考虑标量，矢量和张量夸克流，并假设没有轻子味依赖。我们允许混合中微子夸克洛伦兹耦合，并考虑两种类型的情况下：（i）在核水平上的相互作用是目前在一个时间，（ii）两个相互作用是同时存在的。对于情形（i），我们的研究结果表明，标量相互作用是最严重的限制，特别是赝标量标量中微子夸克耦合。相比之下，张量和非标准矢量相互作用仍然能够实现相当大的有效参数。我们发现，以及一个额外的矢量相互作用时，提高了数据拟合相比，假设只有标准模型的贡献。在场景（ii）中，两个相互作用的存在放松了边界，并打开了参数空间中原本封闭的区域，其效果在标量向量和标量张量的情况下更为明显。我们指出，除了矢量的情况下，我们的结果代表了最严格的边界上的有效中微子夸克广义相互作用的介质质量为$\sim 1\,$ GeV。他们举行，以及较大的调解人群众，在这种情况下，他们应该进行比较，从中微子深度非弹性散射数据的限制。

英文摘要：

Effective neutrino-quark generalized interactions are entirely determined by Lorentz invariance, so they include all possible four-fermion non derivative Lorentz structures. They contain neutrino-quark non-standard interactions as a subset, but span over a larger set that involves effective scalar, pseudoscalar, axial and tensor operators. Using recent COHERENT data, we derive constraints on the corresponding couplings by considering scalar, vector and tensor quark currents and assuming no lepton flavor dependence. We allow for mixed neutrino-quark Lorentz couplings and consider two types of scenarios in which: (i) one interaction at the nuclear level is present at a time, (ii) two interactions are simultaneously present. For scenarios (i) our findings show that scalar interactions are the most severely constrained, in particular for pseudoscalar-scalar neutrino-quark couplings. In contrast, tensor and non-standard vector interactions still enable for sizable effective parameters. We find as well that an extra vector interaction improves the data fit when compared with the result derived assuming only the standard model contribution. In scenarios (ii) the presence of two interactions relaxes the bounds and opens regions in parameter space that are otherwise closed, with the effect being more pronounced in the scalar-vector and scalar-tensor cases. We point out that barring the vector case, our results represent the most stringent bounds on effective neutrino-quark generalized interactions for mediator masses of order $\sim 1\,$GeV. They hold as well for larger mediator masses, case in which they should be compared with limits from neutrino deep-inelastic scattering data.

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