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arXiv 2102.07984hep-ph
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在$\bar{B}_s^0 \to {π^+}{π^-}K^{*0}$中搜索直接CP破坏

Hunting for direct CP violation in $\bar{B}_s^0 \to {π^+}{π^-}K^{*0}$

Sheng-Tao Li, Gang Lü

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摘要：

在微扰QCD方法中，基于一级同位旋对称性破缺，我们研究了$\bar{B}_s^0\toρ(ω)K^{*0}\to {π^+}{π^-}K^{*0}$衰变中的直接$CP$破坏。一个有趣的机制，适用于扩大的$CP$违反不对称性涉及之间的电荷对称性破缺$ρ$和$ω$。我们发现当$π^+π^-$对的不变质量在$ω$共振附近时，$CP$破坏是由$ρ-ω$混合机制引起的。对于$\bar{B}^0_{s}\toρ(ω)K^{*0}\to{π^+}{π^-}K^{*0}$的衰变过程，最大$CP$破坏可以达到$-59.12\%$。此外，考虑到$ρ-ω$混合，我们计算了$\bar{B}_s^0 \rightarrow ρ(ω) K^{*0}$的分支比。我们还讨论了在大型强子对撞机上观察到预测的$CP$违反不对称性的可能性。

英文摘要：

In perturbative QCD approach, based on the first order of isospin symmetry breaking, we study the direct $CP$ violation in the decay of $\bar{B}_s^0\toρ(ω)K^{*0}\to {π^+}{π^-}K^{*0}$. An interesting mechanism is applied to enlarge the $CP$ violating asymmetry involving the charge symmetry breaking between $ρ$ and $ω$. We find that the $CP$ violation is large by the $ρ-ω$ mixing mechanism when the invariant masses of the $π^+π^-$ pairs is in the vicinity of the $ω$ resonance. For the decay process of $\bar{B}^0_{s}\toρ(ω)K^{*0}\to{π^+}{π^-}K^{*0}$, the maximum $CP$ violation can reach $-59.12\%$. Furthermore, taking $ρ-ω$ mixing into account, we calculate the branching ratio for $\bar{B}_s^0 \rightarrow ρ(ω) K^{*0}$. We also discuss the possibility of observing the predicted $CP$ violation asymmetry at the LHC.

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