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arXiv 1801.03375hep-phhep-ex
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根据扩展标量扇区的$b \to c \ell ν$异常

$b \to c \ell ν$ anomalies in light of extended scalar sectors

Aritra Biswas, Dilip Kumar Ghosh, Sunando Kumar Patra, Avirup Shaw

摘要:

考虑到最近的实验结果的排他性半轻子$B$介子衰变显示出相当大的偏离他们的标准模型预测的轻子味的普遍性和保持正在进行的和拟议的非标准希格斯搜索记住,我们探讨了带电电流味观测($\mathcal{R}_{D^{(*)}}$,$\mathcal{R}_{J/ψ}$),在其他$b\to c\ell ν$过渡,在存在一个相关的标量电流有效的新的物理算子。我们使用$B_c$寿命和预测的界限上的分支分数的$B_c \to τν$衰减的约束。我们示出了允许的参数空间中的实部和虚部的相应的威尔逊系数,这样的相互作用。在此基础上,我们研究了两个基准模型的发展前景,分别将Wilson系数变为实态(Georgi-Machacek(GM))和复态(Leptoquark(LQ))。我们表明,从$b\to c\ell ν$对GM参数的约束是一致的,如果我们放弃了\Babar~结果与其他风味的模型约束。包括那些对模型不利的因素超过$3σ$。另一方面,一个基准LQ的情况下,这引起了一个单一的标量电流有效的相互作用,仍然允许在$68\%$的置信水平,虽然与收缩的参数空间。

英文摘要:

Considering the recent experimental results on exclusive semileptonic $B$ meson decays showing sizable departure from their Standard Model prediction of lepton flavor universality and keeping ongoing and proposed non-standard Higgs searches in mind, we explore the charged current flavor observables ($\mathcal{R}_{D^{(*)}}$, $\mathcal{R}_{J/ψ}$), among other $b\to c\ell ν$ transitions, in the presence of a relevant scalar current effective new physics operator. We use $B_c$ lifetime and predicted bounds on the branching fraction of $B_c \to τν$ decay as constraints. We show the allowed parameter space in terms of the real and imaginary parts of the corresponding Wilson coefficients for such interactions. Under the light of obtained results, we study the prospect of two benchmark models, rendering the Wilson coefficients real (Georgi-Machacek (GM)) and complex (Leptoquark (LQ)) respectively. We show that constraints from $b\to c\ell ν$ on GM parameters are consistent with other flavor constraints on the model, if we drop the \Babar~results. Including those disfavors the model by more than $3σ$. On the other hand, one benchmark LQ scenario, which gives rise to a single scalar current effective interaction, is still allowed within $68\%$ confidence level, albeit with a shrunk parameter space.

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