论文标题
$ \ bar b \ to d^{（*）} \ ell \ bar {x} $在有效的现场理论中衰减，右手中微子很大
$\bar B \to D^{(*)} \ell \bar{X}$ decays in effective field theory with massive right-handed neutrinos
论文作者
论文摘要
我们计算出$ b $ meson衰变的完整微分衰减分布，$ \ bar b \ to d^{（*）} \ ell \ bar {x} $，在低能效率有效的场理论（左）理论（左）框架中的大量右手（RH）中微子。我们发现，与无质量的情况相比，巨大的RH中微子不会引入任何新的角结构，但会导致角度可观察到的显着扭曲。我们研究了由RH Neutrinos（SMNEFT）扩展的标准模型有效田间理论（SMEFT）允许的低能四边形操作员的现象学。我们表明，要解释前向后不对称的差异的正值，$Δa_ {\ text {fb}}} \ equiv a _ _ {\ text {fb}}^μ-a _ {\μ-a _ {\ text {fb}}}我们还对$ q^2 $依赖的角度可观察物进行预测，以激发未来的测量。
We calculate the complete differential decay distributions for the $B$ meson decays, $\bar B \to D^{(*)} \ell \bar{X}$, to a massive right-handed (RH) neutrino in the low-energy effective field theory (LEFT) framework. We find that a massive RH neutrino does not introduce any new angular structures compared to the massless case, but can cause significant distortions in angular observables. We study the phenomenology of low-energy four-fermion operators permitted by the standard model effective field theory (SMEFT) extended with RH neutrinos (SMNEFT). We show that to explain the positive value of the difference in forward-backward asymmetries, $ΔA_{\text{FB}}\equiv A_{\text{FB}}^μ-A_{\text{FB}}^e$, tentatively inferred from Belle data, the RH neutrino must be massive. We also make predictions for $q^2$ dependent angular observables to motivate future measurements.
