论文标题
探索Leptoquark模型中缺少能量的魅力衰减
Exploring charm decays with missing energy in leptoquark models
论文作者
论文摘要
我们调查了标量leptoquarks会对改变风味的中性粘性的后果效果产生后果影响，而诱人的hadrons则被标准模型或无菌中微子带走的能量缺失的最终状态（$ \ not \！\！e $）。我们专注于涉及$ r_2 $，$ \ tilde r_2 $和$ \ bar s_1 $ leptoquarks的场景，并考虑到各种相关的约束，得知梅森混合量以及从撞机搜索中推论的限制可能具有重要意义。我们特别发现，迷人的梅森的分支分数损失$ d \ to m \！\ not \！\！如果$ r_2 $引起的，$ 10^{ - 7} $ - $ 10^{ - 6} $ latver $ r_2 $，并且$ \ tilde r_2 $相比要少得多。相比之下，$ \ bar s_1 $的贡献是将其伴侣与右撇子上的夸克和无菌中微子的贡献，可能会导致分支的分支高至$ 10^{ - 3} $。这表明这些迷人的强子衰变可能是BESIII和BELLE II实验或将来的超级魅力工厂的范围，并且可能是与无菌中微子相互作用的潜在有希望的探针。
We investigate the possibility that scalar leptoquarks generate consequential effects on the flavor-changing neutral-current decays of charmed hadrons into final states with missing energy ($\not\!\!E$) carried away by either standard model or sterile neutrinos. We focus on scenarios involving the $R_2$, $\tilde R_2$, and $\bar S_1$ leptoquarks and take into account various pertinent constraints, learning that meson-mixing ones and those inferred from collider searches can be of significance. We find in particular that the branching fractions of charmed meson decays $D\to M\!\not\!\!E$, $M=π,ρ$, and $D_s\to K^{(*)}\!\not\!\!E$ and singly charmed baryon decays $Λ_c^+\to p\!\not\!\!E$ and $Ξ_c\toΣ\!\not\!\!E$ are presently allowed to attain the $10^{-7}$-$10^{-6}$ levels if induced by $R_2$ and that the impact of $\tilde R_2$ is comparatively much less. In contrast, the contributions of $\bar S_1$, which couples to right-handed up-type quarks and the sterile neutrinos, could lead to branching fractions as high as order $10^{-3}$. This suggests that these charmed hadron decays might be within reach of the BESIII and Belle II experiments or future super charm-tau factories and could serve as potentially promising probes of leptoquark interactions with sterile neutrinos.
