论文标题
分析带电的标量玻色子对带电的$ B $ MESON异常的贡献
Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies
论文作者
论文摘要
Babar，Belle和LHCB实验收集的实验测量对与半抑制过渡相关的不同可观察到的实验，表明与标准模型预测的分歧尊重。我们分析了在两个Higgs Doublet模型的框架内对这些带电的电汇$ B $ Meson异常的贡献，该框架具有最通用的Yukawa耦合，涉及第三代的Quarks和Leptons，涉及左手和右手（右手）中性群。我们对可容纳这些异常的Yukawa耦合参数空间进行现象学研究。我们考虑了来自HFLAV世界平均和Belle组合的最新数据，以及上限$ {\ rm br}（b_c^ - \ toτ^ - \barν_τ）<30 \％$和$ 10 \％$。此外，我们在研究中包括Belle II实验可以实现并探索的$ r（d^{（\ ast）}）$上的前景测量值，这是对相应带电的标量Yukawa耦合的未来影响。该分析更新了现有文献，并包括新的重要可观察物。我们的结果表明，当前的实验性$ b \ rightarrowcτ\barν_τ$数据和Belle II投影有利于解释带电的标量玻色子与右手中微子相互作用的解释。此外，作为有关充电标量玻色子解释的旁边分析，我们重新审视$ r（d^\ ast）$和$ {\ rm br}（\ rm br}（b_c^ - \ toτ^ - \barν_τ）$之间的关系，通过调查$ r（d^^）的$ r（D^^^）是否构成$ r（\barν_τ）$ $ b_c $ lifetime仍然有效，对于最近的数据，$ r（d^{\ ast}）$上的Belle II潜在客户。最后，我们重新检查了在II型2HDM的上下文中，解决$ r（d^{（\ ast）}）$异常。
Experimental measurements collected by the BABAR, Belle, and LHCb experiments on different observables associated with the semileptonic transition $b \to c τ\barν_τ$, indicate the existence of disagreement respect with the Standard Model predictions. We analyse the charged scalar boson contributions to these charged-current $B$ meson anomalies within the framework of two Higgs doublet model with the most general Yukawa couplings to quarks and leptons from the third generation, involving left-handed and right-handed (sterile) neutrinos. We perform a phenomenological study of the Yukawa couplings parameter space that accommodates these anomalies. We consider the most recent data from HFLAV world-average and Belle combination, and the upper limits ${\rm BR}(B_c^- \to τ^- \barν_τ) < 30\%$ and $10\%$. In addition, we include in our study the prospect measurements on $R(D^{(\ast)})$ that the Belle II experiment could achieve and explore, for the first time, the future implications for the corresponding charged scalar Yukawa couplings. This analysis updates the existing literature and includes new important observables. Our results show that current experimental $b\rightarrow c τ\barν_τ$ data and Belle II projection favor the interpretation of a charged scalar boson interacting with right-handed neutrinos. Furthermore, as a side analysis regarding the charged scalar boson interpretation, we revisit the relation between $R(D^\ast)$ and ${\rm BR}(B_c^- \to τ^- \barν_τ)$ by investigating whether the claim that pseudoscalar new physics interpretations of $R(D^{\ast})$ are implausible due to the $B_c$ lifetime is still valid, to the light of the recent data and Belle II prospects on $R(D^{\ast})$. Lastly, we reexamine addressing the $R(D^{(\ast)})$ anomalies in the context of the 2HDM of Type II.
