论文标题
放大$ b _ {（s）} \ hh $衰减中的CP违规
Zooming into CP violation in $B_{(s)}\to hh$ Decays
论文作者
论文摘要
LHCB的合作最近报道了企鹅以$ b^0_s \ to k^-k^+$衰减和进一步的新测量结果的首次观察，表明$ b^0_s \ to k^0_s \ to k^-k^-k^-k^+$ b^0_d $ b^0_d $ b^to $ b^0_s \ to $ b^0_s \ to $ b^0_s和tho $ b^to $ b^0_s和tho $ b^to $和π^-π^+$，$ b^0_s \ to K^-π^+$模式。我们表明，这些令人困惑的差异可以通过标准模型中的大量企鹅歼灭和交换拓扑来适应这些差异，并限制它们。利用$ u $ -spin对称性，我们提取$ b^0_s \ in cp niangle的角度$γ$从$ b^0_s \到k^-k^-k^+$，$ b^0_d \ toπ^-π^-π^+$ holy单独使用，从树级$ b \ to dk $衰减。 $ b^0_s $ - $ \ bar b^0_s $混合阶段$ ϕ_s $可以从$ b^0_s \ to k^-k^+$中以干净的方式从CP违规测量中提取。我们提出了一种新策略，并提取$ ϕ_s = - （3.6 \ pm 5.4）^\ circ $。该结果与从$ b^0_s \到j/ψϕ $衰减的确定一致。新的CP侵略贡献将以不同的方式影响这些决定。因此，随着实验图表的锐化，继续监视这两个有趣的事很有趣。
The LHCb collaboration has recently reported the first observation of CP violation in the penguin-dominated $B^0_s\to K^-K^+$ decay and further new measurements, indicating differences between the direct CP asymmetries of both the $B^0_s\to K^-K^+$, $B^0_d\toπ^-K^+$ and the $B^0_d\to π^-π^+$, $B^0_s\to K^-π^+$ modes. We show that these puzzling differences can be accommodated through sizeable penguin annihilation and exchange topologies in the Standard Model, and constrain them. Utilising the $U$-spin symmetry, we extract the angle $γ$ of the unitarity triangle from the CP asymmetries in the $B^0_s\to K^-K^+$, $B^0_d\to π^-π^+$ system alone, finding $γ=(65^{+11}_{-7})^\circ$, in perfect agreement with the determination from tree-level $B\to DK$ decays. The $B^0_s$--$\bar B^0_s$ mixing phase $ϕ_s$ can be extracted from CP violation measurements in $B^0_s\to K^-K^+$ in a clean way. We present a new strategy and extract $ϕ_s=-(3.6\pm 5.4)^\circ$. This result is in agreement with the determination from $B^0_s\to J/ψϕ$ decays. New CP-violating contributions would influence these determinations differently. Hence it is interesting to keep monitoring both as the experimental picture sharpens.
