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arXiv 2005.01543hep-phhep-ex
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从中微子-核相干散射和介子不可见衰变看一般中微子与不育中微子的相互作用

General neutrino interactions with sterile neutrinos in light of coherent neutrino-nucleus scattering and meson invisible decays

Tong Li, Xiao-Dong Ma, Michael A. Schmidt

摘要:

本文研究了在有效场论中,由CEνNS过程和介子不可见衰变得到的类属中微子与无菌中微子相互作用的电流边界。首先用介于电弱标度和手征对称性破缺标度之间的低能有效场论(LNEFT)描述了夸克与左手SM中微子和/或右手中微子的相互作用.我们完成了独立的运营商的基础上,包括轻子数守恒(LNC)和轻子数违反(LNV)运营商涉及右手中微子的LNEFT到6维。我们从相干观测中平移了LNEFT Wilson系数的界,并计算了轻介子不可见衰变的分支分数。LNEFT上的界限,然后映射到SM有效场论与无菌中微子(SMNEFT),以限制新的物理以上的电弱标度。我们发现,介子不可见衰变可以为两个(一个)活动中微子的夸克-中微子相互作用中的τ中微子味分量和s夸克分量以及没有任何活动中微子场的有效算符提供唯一灵敏的探针。CEνNS过程对所有其他威尔逊系数都有最严格的限制。在假定SMNEFT中每次只存在一个主导Wilson系数和可忽略的无菌中微子质量的情况下,新物理标度的最严格极限是LNEFT中相应偶极算符的2.7 - 10 TeV和LNEFT中中微子-夸克算符的0.5 - 1.5 TeV。

英文摘要:

In this work we study the current bounds from the CEνNS process and meson invisible decays on generic neutrino interactions with sterile neutrinos in effective field theories. The interactions between quarks and left-handed SM neutrinos and/or right-handed neutrinos are first described by the low-energy effective field theory (LNEFT) between the electroweak scale and the chiral symmetry breaking scale. We complete the independent operator basis for the LNEFT up to dimension-6 by including both the lepton-number-conserving (LNC) and lepton-number-violating (LNV) operators involving right-handed neutrinos. We translate the bounds on the LNEFT Wilson coefficients from the COHERENT observation and calculate the branching fractions of light meson invisible decays. The bounds on LNEFT are then mapped onto the SM effective field theory with sterile neutrinos (SMNEFT) to constrain new physics above the electroweak scale. We find that the meson invisible decays can provide the only sensitive probe for τ neutrino flavor component and s quark component in the quark-neutrino interactions involving two (one) active neutrinos and for the effective operators without any active neutrino fields. The CEνNS process places the most stringent bound on all other Wilson coefficients. By assuming one dominant Wilson coefficient at a time in SMNEFT and negligible sterile neutrino mass, the most stringent limits on the new physics scale are 2.7 - 10 TeV from corresponding dipole operator in LNEFT and 0.5 - 1.5 TeV from neutrino-quark operator in LNEFT.

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