Radiative decays of charged leptons in the seesaw effective field theory with one-loop matching

Radiative decays of charged leptons in the seesaw effective field theory with one-loop matching
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单环匹配跷跷板有效场理论中带电轻子的辐射衰变

DOI:
10.1016/j.physletb.2021.136463
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发表时间:
2021-02
期刊:
Phys. Lett. B
影响因子:
--
通讯作者:
Shun Zhou
Shun Zhou
中科院分区:
其他
文献类型:
--
作者:
Di Zhang;Shun Zhou

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具有三个重马约拉纳中微子的规范 I 型跷跷板模型是标准模型 (SM) 最自然的扩展之一,可容纳三个普通中微子的微小马约拉纳质量。在低能尺度上,马约拉纳中微子质量和轻子风味混合的幺正性破坏在文献中得到了广泛讨论,它们分别由跷跷板有效场理论(SEFT)中独特的五维Weinberg算子和一维六算子通过树级匹配生成。在这项工作中,我们阐明带电轻子 β−→ α−+ γ 辐射衰变的自洽计算需要具有单环匹配的 SEFT,其中新的六维算子出现并做出了重要贡献。首次通过有效理论与全跷跷板模型的单循环匹配,计算出所有相关六维算子的威尔逊系数,并应用于计算带电轻子的辐射衰变总速率。
The canonical type-I seesaw model with three heavy Majorana neutrinos is one of the most natural extensions of the standard model (SM) to accommodate tiny Majorana masses of three ordinary neutrinos. At low-energy scales, Majorana neutrino masses and unitarity violation of lepton flavor mixing have been extensively discussed in the literature, which are respectively generated by the unique dimension-five Weinberg operator and one dimension-six operator in the seesaw effective field theory (SEFT) with the tree-level matching. In this work, we clarify that a self-consistent calculation of radiative decays of charged leptons β−→ α−+ γ requires the SEFT with one-loop matching, where new six-dimensional operators emerge and make important contributions. For the first time, the Wilson coefficients of all the relevant six-dimensional operators are computed by carrying out the one-loop matching between the effective theory and full seesaw model, and applied to calculate the total rates of radiative decays of charged leptons.
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