论文标题
独家半乳房$ b_c $ -meson腐烂到径向兴奋的charmon和魅力梅森州
Exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states
论文作者
论文摘要
在最近测量半分支分支的比率之后：$ {\ cal r} _ {j/ψ}，{\ cal r} _d $和$ {\ cal r} _ {d^*} $由lhcb，belle和hflav的协作量，我们定位的formation for necati $ b_c $ -Meson在相对论独立夸克（RIQ）模型框架内的整个运动区域中的径向激发的charmon和魅力梅森状态。我们评估了$ b \ to c，u $ the Quark级过渡的衰减过程中的Lepton质量效应。 Our predictions on branching fractions for $B_c\to η_c/ψ(nS)$ are found $\sim10^{-2}-10^{-4}$ and that for $B_c\to D^*(nS)$ are $\sim 10^{-4}$ in their $e^-$ decay modes, which lie within the detection accuracy of current experiment.我们对分支分数，向后的不对称和不对称参数的预测在与其他模型预测的合理一致时发现。希望可以在LHC和Tevatron的将来的实验中进行测试。我们预测的在该领域的可观察到的$ {\ cal r} $可与其他标准模型（SM）预测相媲美，这些预测违反了Lepton风味普遍性暗示SM超出SM的新物理学。
In the wake of recent measurements of ratios of semileptonic branching fractions: ${\cal R}_{J/ψ}, {\cal R}_D$ and ${\cal R}_{D^*}$ reported by the LHCb, BELLE and HFLAV Collaborations, we calculate invariant form factors for the exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states in the full kinematical region within the framework of relativistic independent quark (RIQ)model. We evaluate the lepton mass effect in the decay processes induced by $b\to c,u$ transition at the quark level. Our predictions on branching fractions for $B_c\to η_c/ψ(nS)$ are found $\sim10^{-2}-10^{-4}$ and that for $B_c\to D^*(nS)$ are $\sim 10^{-4}$ in their $e^-$ decay modes, which lie within the detection accuracy of current experiment. Our predictions on branching fractions, forward backward asymmetry and asymmetry parameter are found in reasonable agreement with other model predictions; which can hopefully be tested in future experiments at LHC and Tevatron. Our predicted observable ${\cal R}$ in this sector are found comparable to other standard model (SM) predictions that violate the lepton flavor universality hinting at new physics beyond SM.
