arXiv 2008.007432020-08hep-ph

中微子-核相干散射中的圈效应

Loop effect in the coherent neutrino-nucleus scattering

Tong Li, Jiajun Liao

备注：: 18 pages, 4 figures. Version to appear in JHEP
DOI：: 10.1007/JHEP02(2021)099

摘要：

一般中微子模型描述了中微子和奇异费米子之间的联系。在这个模型中，中微子可以转化为新的费米子，从而在中微子散射实验中产生新的反冲谱。我们通过计算树能级和圈能级对中微子-核相干弹性散射的贡献来研究一般中微子相互作用。我们说明了散射采取的框架下的一个简化的中微子模型与狄拉克费米子$χ$和自旋0调解。当夸克扇区中CP相位为0和$π/2$时，探测过程分别由树级和环级贡献主导。通过拟合COHERENT数据，我们研究了介体与新粒子$χ$或夸克之间耦合的约束条件。$m_χ$大于入射中微子最大能量的参数空间也可以通过包括环能级贡献来约束。

英文摘要：

A connection between the neutrino and an exotic fermion is described in the general neutrino model. In this model the neutrinos can convert into the new fermion and thus the interaction leads to novel recoil spectrum in the neutrino scattering experiments. We study the general neutrino interaction by evaluating both the tree-level and loop-level contributions to the coherent elastic neutrino-nucleus scattering. We illustrate the scattering by taking the framework of a simplified neutrino model with a Dirac fermion $χ$ and a spin-0 mediator. For the CP phase in the quark sector being 0 and $π/2$, the detection processes are dominated by the tree-level and loop-level contribution, respectively. We investigate the constraints on the couplings between the mediator and the new particle $χ$ or the quarks by fitting to the COHERENT data. The parameter space with $m_χ$ larger than the maximal energy of incoming neutrinos can be also constrained by including the loop-level contribution.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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