Constraints on the charged currents in general neutrino interactions with sterile neutrinos
Constraints on the charged currents in general neutrino interactions with sterile neutrinos
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DOI：
10.1007/jhep10(2020)115
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发表时间：
2020-07
影响因子：
5.4
通讯作者：
Tong Li;Xiao-Dong Ma;M. Schmidt
中科院分区：
文献类型：
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作者：
Tong Li;Xiao-Dong Ma;M. Schmidt
本文研究了有效场论中一般中微子与无菌中微子相互作用中夸克-轻子带电流的低能精确测量的意义。低能测量中的物理学由定义在电弱标度以下的无菌中微子扩展的低能有效场论（LNEFT）描述。我们还考虑了重整化群运行，并将LNEFT与标准模型（SM）有效场论与无菌中微子（SMNEFT）相匹配，以约束电弱尺度以上的新物理（NP）。最灵敏的低能探针来自赝标介子的轻子衰变和强子τ轻子衰变，包括精确的衰变分支分数、轻子味普适性和Cabibbo-Kobayashi-Maskawa（CKM）么正性。我们还考虑了其他限制，包括核β衰变。带电电流算符的约束一般比夸克-中微子中性电流算符的约束强。我们发现，对于带下夸克的轻子数守恒算符和轻子数违反算符，SMNEFT的NP标度上的最严格边界分别为74（110）TeV和9.8（13）TeV.
In this work we investigate the implication of low-energy precision measurements on the quark-lepton charged currents in general neutrino interactions with sterile neutrinos in effective field theories. The physics in low-energy measurements is described by the low-energy effective field theory extended with sterile neutrinos (LNEFT) defined below the electroweak scale. We also take into account renormalization group running and match the LNEFT onto the Standard Model (SM) effective field theory with sterile neutrinos (SMNEFT) to constrain new physics (NP) above the electroweak scale. The most sensitive low-energy probes are from leptonic decays of pseudoscalar mesons and hadronic tau lepton decays in terms of precise decay branching fractions, the lepton flavor universality and the Cabibbo-Kobayashi-Maskawa (CKM) unitarity. We also consider other constraints including nuclear beta decay. The constraints on charged current operators are generally stronger than the ones for quark-neutrino neutral current operators. We find that the most stringent bounds on the NP scale of lepton-number-conserving and lepton-number-violating operators in SMNEFT are 74 (110) TeV and 9.8 (13) TeV, respectively, for the operators with down (strange) quark.