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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2102.02538hep-ph
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$a_0^0(980)-f_0(980)$混合对$B^-\rightarrow K^- π^+π^-$衰变定域PDMATHAAB破坏的影响

The impact of $a_0^0(980)-f_0(980)$ mixing on the localized $CP$ violations of the $B^-\rightarrow K^- π^+π^-$ decay

Jing-Juan Qi, Zhen-Yang Wang, Chao Wang, Zhen-Hua Zhang, Xin-Heng Guo

摘要:

在QCD因子分解方法的框架下,我们分别研究了有和没有$a_0^0(980)-f_0(980)$混合机制的$B^-\rightarrow K^- π^+π^-$衰变的定域$CP$破坏,发现当$π^+π^-$对的质量在$f_0(980)$共振附近时,这种混合效应可以增强定域$CP$破坏.相应的理论预测结果分别为$\mathcal{A}_{CP}(B^-\rightarrow K f_0 \rightarrow K^-π^+π^-)=[0.24, 0.36]$和$\mathcal{A}_{CP}(B^-\rightarrow K^- f_0(a_0) \rightarrow K^-π^+π^-)=[0.33, 0.52]$。同时,我们还计算了$B^-\rightarrow K^-f_0(980)\rightarrow K^-π^+π^-$衰变的分支分数,与实验结果一致。我们建议在理论和实验上研究$B$或$D$介子衰变的$CP$破坏时,应考虑$a_0^0(980)-f_0(980)$混合机制。

英文摘要:

In the framework of the QCD factorization approach, we study the localized $CP$ violations of the $B^-\rightarrow K^- π^+π^-$ decay with and without $a_0^0(980)-f_0(980)$ mixing mechanism, respectively, and find that the localized $CP$ violation can be enhanced by this mixing effect when the mass of the $π^+π^-$ pair is in the vicinity of the $f_0(980)$ resonance. The corresponding theoretical prediction results are $\mathcal{A}_{CP}(B^-\rightarrow K f_0 \rightarrow K^-π^+π^-)=[0.24, 0.36]$ and $\mathcal{A}_{CP}(B^-\rightarrow K^- f_0(a_0) \rightarrow K^-π^+π^-)=[0.33, 0.52]$, respectively. Meanwhile, we also calculate the branching fraction of the $B^-\rightarrow K^-f_0(980)\rightarrow K^-π^+π^-$ decay, which is consistent with the experimental results. We suggest that $a_0^0(980)-f_0(980)$ mixing mechanism should be considered when studying the $CP$ violation of the $B$ or $D$ mesons decays theoretically and experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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