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arXiv 1402.6912hep-phhep-ex
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$\bar{B}^0_s \to Kπ,KK$衰变和次序贡献效应

$\bar{B}^0_s \to Kπ,KK$ decays and effects of the next-to-leading order contribution

Jing-Jing Wang, Dong-Ting Lin, Wen Sun, Zhong-Jian Ji, Shan Cheng, Zhen-Jun Xiao

摘要:

利用微扰QCD(pQCD)分解方法,计算了四个$\bar{B}_s^0 \to Kπ$和$K K $衰变的分支比和CP破坏不对称性,其中包含了所有已知的次-首阶(NLO)贡献.数值计算发现:(a)对于不同的衰变模式,非线性光学的贡献可以相长或相消地干涉LO部分:(b)对于$Br(\bar{B}^0_s \to K^+ π^-)$,非线性光学的贡献导致$22\%$的减小,而对于其他三种考虑的$\bar{B}_s$衰变,非线性光学的贡献导致$\sim 50\%$的增强,因此在解释分支比的测量值方面起着重要的作用;(c)对于$\bar{B}_s^0 \to K^+ π^-$和$\bar{B}_s^0 \to K^+K^- $衰变,直接和混合引起的CP破坏不对称性的NLO pQCD预言在符号和幅度上都与测量值非常一致.

英文摘要:

By employing the perturbative QCD(pQCD) factorization approach, we calculate the branching ratios and CP violating asymmetries of the four $\bar{B}_s^0 \to Kπ$ and $K K $ decays, with the inclusion of all known next-to-leading order (NLO) contributions. We find numerically that (a) the NLO contribution can interfere with the LO part constructively or destructively for different decay modes; (b) the NLO contribution leads to a $22\%$ decrease for $Br(\bar{B}^0_s \to K^+ π^-)$, but $\sim 50\%$ enhancements to other three considered $\bar{B}_s$ decays, and therefore play an important role in interpreting the measured values of the branching ratios; and (c) for both $\bar{B}_s^0 \to K^+ π^-$ and $\bar{B}_s^0 \to K^+K^- $ decays, the NLO pQCD predictions for the direct and mixing induced CP-violating asymmetries agree very well with the measured values in both the sign and the magnitude.

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