论文标题
（半）看不见的介子衰减中的光a中子中微子
Light Majorana Neutrinos in (Semi)invisible Meson Decays
论文作者
论文摘要
我们重新考虑将伪内中微子对的伪内中微子对腐烂，并可能在存在（轻）主要中微子的情况下其他光子。为此，我们得出了具有物理上可解释和不可还原参数集的中微子质量矩阵的模型无关的一般参数化。参数化对任何数量的中微子有效，并在重的major和（伪）狄拉克中微子极限之间平稳地插入。我们将新的参数化应用于$ p \ rightarrow门和$ p \rightarrowννγ$衰减的研究中的SM衰减。我们更新$ b_ {s，d} \rightArrowννγ$的分支比率的SM预测，并讨论$ b_ {s，d} \ rightArrow e _ {\ rm miss}（γ）$ neatrino质量和混合参数的灵敏度。
We reconsider decays of pseudoscalar mesons (P) to neutrino pairs and possibly additional photons in presence of (light) Majorana neutrinos. For this purpose we derive a model-independent general parametrization of neutrino mass matrices with physically interpretable and irreducible set of parameters. The parametrization is valid for any number of neutrinos and interpolates smoothly between the heavy Majorana and the (pseudo)Dirac neutrino limits. We apply the new parametrization to the study of $P \rightarrow νν$ and $P \rightarrow ννγ$ decays within the SM extended by additional singlet fermions. We update the SM predictions for the branching ratios of $B_{s,d} \rightarrow ννγ$ and discuss the sensitivity of the $B_{s,d} \rightarrow E_{\rm miss} (γ)$ decays to neutrino mass and mixing parameters.
