论文标题
用$ b \ to c \ bar u d（s）$驯服新的物理
Taming New Physics in $b \to c \bar u d (s) $ with $τ(B^+)/τ(B_d)$ and $a_{sl}^d$
论文作者
论文摘要
灵感来自于最近观察到的实验数据与基于QCD分解的理论预测之间的紧张局势，对于几种颜色允许的非终止的$ b $ b $ -meson衰减，我们研究了衰减通道中新物理学的潜在大小（NP）效果的潜在大小$ b \ to c \ bar bar {u} d（u} d（u} d（s）$。从描述$ b \到c \ bar {u} d（s）$过渡的最一般有效的哈密顿人开始，我们计算出NP贡献$ b $ -b $ -meson Lifetime和$ b $ b $ mix的理论预测。众所周知的寿命比$τ（B^+）/τ（B_D）$和在半级别的CP不对称$ a_ {sl}^d $上绑定的实验，对某些NP Wilson系数提供了强大的互补约束。
Inspired by the recently observed tensions between the experimental data and the theoretical predictions, based on QCD factorisation, for several colour-allowed non-leptonic $B$-meson decays, we study the potential size of new physics (NP) effects in the decay channels $b \to c \bar{u} d(s)$. Starting from the most general effective Hamiltonian describing the $b \to c \bar{u} d(s)$ transitions, we compute NP contributions to the theoretical predictions of $B$-meson lifetime and of $B$-mixing observables. The well-known lifetime ratio $τ(B^+)/τ(B_d)$ and the experimental bound on the semi-leptonic CP asymmetry $a_{sl}^d$, provide strong, complementary constraints on some of the NP Wilson coefficients.
