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arXiv 1503.08176hep-phhep-ex
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粲介子到两个赝标量的非轻子衰变

Non-leptonic decays of Charmed mesons into two Pseudoscalars

Aritra Biswas, Nita Sinha, Gauhar Abbas

摘要:

我们研究共振耦合通道末态相互作用(FSI)的作用,以及弱湮灭和交换的贡献,在解释所有的两体强子$D\rightarrow PP$衰变模式的数据。在非么正化振幅中,我们包括具有不可因式分解修正的修正Wilson系数作为参数。对于强子形状因子,采用z-级数展开方法得到了$q^2$依赖关系。FSI效应通过现象学方法与从观测中获得的各种通道的共振宽度相结合,其他作为额外参数从所有理论速率与测量速率的拟合中确定。我们的结果相当难以解释的$D^0\rightarrow K^+K^-, π^+π^- $与测量值一致。我们证明,弱交换以及FSI效应需要得到正确的分支比的$D^ \rightarrow K^0\bar{K^0}$模式。使用我们的unitarized振幅,我们评估的强相位差之间的振幅$D^0\rightarrow K^-π^+$和$D^0\rightarrow K^+π^-$,并发现它是在最近的BES III的结果完全一致。

英文摘要:

We examine the role of resonant coupled channel final state interactions (FSI), as well as weak annihilation and exchange contributions in explaining all the two body hadronic $D\rightarrow PP$ decay modes data. In the un-unitarized amplitudes we include modified Wilson coefficients with non-factorizable corrections as parameters. For the hadronic form factors, the z-series expansion method is used to get the $q^2$ dependence. The FSI effects are incorporated via a phenomenological approach with widths of resonances to various channels taken from observations where available, and others as additional parameters to be determined from fits of all the theoretical rates to the measured ones. Our results for the rather hard to explain $D^0\rightarrow K^+K^-, π^+π^- $ are in agreement with measured values. We demonstrate that both weak exchange as well as FSI effects are required to get the correct branching ratio for the $D^ \rightarrow K^0\bar{K^0}$ mode. Using our unitarized amplitudes we evaluate the strong phase difference between the amplitudes for $D^0\rightarrow K^-π^+$ and $D^0\rightarrow K^+π^-$ and find it to be in complete agreement with the recent BES III result.

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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