Analysing the charged scalar boson contribution to the charged-current B meson anomalies,Journal of Physics G: Nuclear and Particle Physics

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Analysing the charged scalar boson contribution to the charged-current B meson anomalies
Journal of Physics G: Nuclear and Particle Physics ( IF 3.4 ) Pub Date : 2021-01-26 , DOI: 10.1088/1361-6471/abc865
Jonathan Cardozo ₁ , J H Muoz ₁ , Nstor Quintero ₂ , Eduardo Rojas ₃

Affiliation

Experimental measurements collected by the BABAR, Belle, and LHCb experiments on different observables associated with the semileptonic transition $b\to c\tau {\bar{\nu }}_{\tau }$ , indicate the existence of disagreement respect with the Standard Model predictions. We analyze the charged scalar boson contributions to these charged-current B meson anomalies within the framework of two Higgs doublet model (2HDM) 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 $\text{BR}\left({B}_{c}^{-}\to {\tau }^{-}{\bar{\nu }}_{\tau }\right){< }30\%$ and 10%. In addition, we include in our study the prospect measurements on R(D ⁽*⁾) 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 $b\to c\tau {\bar{\nu }}_{\tau }$ 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*) and $\text{BR}\left({B}_{c}^{-}\to {\tau }^{-}{\bar{\nu }}_{\tau }\right)$ by investigating whether the claim that pseudoscalar new physics interpretations of R(D*) 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*). Lastly, we reexamine addressing the R(D ⁽*⁾) anomalies in the context of the 2HDM of type II. We show that with the current Belle combined data is possible to obtain an available parameter space on the plane $\left({M}_{{H}^{{\pm}}},\mathrm{tan}\enspace \beta \right)$ for a simultaneous explanation of the anomalies, in consistency with $B\to \tau {\bar{\nu }}_{\tau }$ and bounds from inclusive radiative B decays. Moreover, projections at the Belle II experiment suggest that the 2HDM of type II would be no longer disfavored.

中文翻译：

分析带电标量玻色子对带电电流B介子异常的贡献

通过BABAR，Belle和LHCb实验收集的与半瘦素转变相关的不同可观察物的实验测量结果 $b \至c \ tau {\ bar {\ nu}} _ {\ tau}$ 表明，存在与标准模型预测不一致的方面。我们在两个Higgs doublet模型（2HDM）的框架内分析了带电标量玻色子对这些带电B介子异常的贡献，其中最普遍的Yukawa与第三代夸克和轻子的耦合包括左手和右手（无菌的）中微子。我们对容纳这些异常的汤川耦合参数空间进行了现象学研究。我们考虑了HFLAV世界平均水平和Belle组合的最新数据以及上限 $\ text {BR} \ left（{B} _ {c} ^ {-} \至{\ tau} ^ {-} {\ bar {\ nu}} _ {\ tau} \ right）{<} \％$ 和10％。此外，我们在研究中还包括了Belle II实验可以实现的R（D ^（ * ^））的前景色测量，并首次探索了相应带电标量Yukawa耦合的未来意义。该分析更新了现有文献，并包括了新的重要观测值。我们的结果表明，当前的实验 $b \至c \ tau {\ bar {\ nu}} _ {\ tau}$ 数据和Belle II投影有利于解释带电标量玻色子与右旋中微子的相互作用。此外，作为关于带电标量玻色子解释的侧面分析，我们再次考察R（D *）与 $\ text {BR} \ left（{B} _ {c} ^ {-} \至{\ tau} ^ {-} {\ bar {\ nu}} _ {\ tau} \ right）$ 通过调查声称的赝新的物理解释是否- [R （d *）是不可信由于乙 _Ç寿命仍然是有效的，最近的数据和贝尔II前景上的光- [R （d *）。最后，我们重新检查在II型2HDM背景下的R（D ^（ * ^））异常。我们表明，利用当前的Belle组合数据，有可能在平面上获得可用参数空间，以便同时解释异常，与包含性辐射B保持一致并受其限制 $\ left（{M} _ {{H} ^ {{\ pm}}}，\ mathrm {tan} \ enspace \ beta \ right）$ $B \ to \ tau {\ bar {\ nu}} _ {\ tau}$ 衰变。此外，Belle II实验的预测表明，II型2HDM将不再受到不利影响。

更新日期：2021-01-26

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