论文标题
在半乳房中研究新物理学
Delving into new physics in semileptonic $b \to c τ\bar ν$ transitions
论文作者
论文摘要
最近，在半蛋白质的$ b $梅森衰减过程中，人们对Lepton非宇宙性观察结果有几种迹象，无论是在中性电流（$ b \ to s ll $）和带电的电流（$ b \ to $ b \ to c l \ bar b b n n _l $）的过渡中。在这些迷人的商的影响下，我们检查了涉及$ b \ to c l \barν_l$ quark级过渡的半衰减衰变。我们通过模型独立分析执行它，以探究新物理学的性质。考虑到最普遍的有效哈密顿量，我们仔细检查$λ_b\ toλ_cτ\barν_τ$，$ b_c^+ \toη_cτ^+ v^+ v^+ v $，$ b \ to d^{**} D_1，D_2^*\} $是在存在新物理学的情况下，是四个最轻的兴奋魅力梅森）过程。我们对不同的新系数进行全球拟合，利用$ r_ {d} $，$ r_ {d^{*}} $，$ r_ {j/ψ} $，$p_τ^{d^*} $和br上的上限（$ b_c^+ \ the+ the_ fum）。然后，我们检查受约束新耦合对分支比率，前后不对称参数，Lepton非宇宙性比率（LNU），LEPTON和HADRON极化不对称的影响。
Recently, several indications of lepton non-universality observables have been perceived in semileptonic $B$ meson decay processes, both in the neutral-current ($b \to s ll $) and charged-current ($b \to c l \bar ν_l$) transitions. Influenced by these fascinating quotients, we examine the semileptonic decays involving the $b \to c l \bar ν_l$ quark level transitions. We execute it through a model independent analysis in order to probe the nature of new physics. Taking into consideration the most general effective Hamiltonian, we scrutinize $Λ_b \to Λ_c τ\bar ν_τ$, $ B_c^+ \to η_c τ^+ ν_τ$, and $ B \to D^{**} τ\bar ν_τ$ (where $D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightest excited charm mesons) processes, in the presence of new physics. We perform a global fit to different sets of new coefficients, making use of the measurements on $R_{D}$, $R_{D^{*}}$, $R_{J/ψ}$, $P_τ^{D^*}$ and the upper limit on Br($B_c^+ \to τ^+ ν_τ$). We then inspect the effect of constrained new couplings on the branching ratios, forward-backward asymmetry parameters, lepton non-universality ratios (LNU), lepton and hadron polarization asymmetries of these decay modes.
