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arXiv 1209.4805hep-ph
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D0到K0S π + π衰变的Dalitz图研究

Dalitz plot studies of D0 to K0S pi+ pi- decays

L. Lesniak, R. Kaminski, A. Furman, J. -P. Dedonder, B. Loiseau

摘要:

本文在准二体QCD因式分解近似下分析了D_0到K_0S π + π衰变的有效数据。湮灭,通过W-交换,振幅被添加到弱衰变树振幅。还考虑了振幅的双重Cabibbo抑制部分。用相应的形状因子描述了S-、P-和D-末态中K介子-π介子对和π介子-π介子对之间的强相互作用。K介子-π介子或π介子-π介子标量和矢量形状因子受其他实验数据的约束。利用么正性、解析性和手征对称性得到了它们的函数形式。我们通过最小化程序来重现达利茨图分布的K 0 S pi-、K 0 S pi+和pi+ pi-有效质量投影。大量(27)非零振幅导致大量参数。将得到的模型分布和分支分数与准确的Belle Collaboration数据进行比较。

英文摘要:

The availaible data on the D0 to K0S pi+ pi- decays are analysed in the framework of the quasi two-body QCD factorization approximation. The annihilation, via W-exchange, amplitudes are added to the weak-decay tree amplitudes. The doubly Cabibbo suppressed parts of the amplitudes are also considered. The strong interactions between the kaon-pion and pion-pion pairs in the S-, P- and D-final states are described in terms of the corresponding form factors. The kaon-pion or pion-pion scalar and vector form factors are constrained by other experimental data. Unitarity, analyticity and chiral symmetry are also used to obtain their functional forms. We go through a minimization procedure to reproduce the K0S pi-, K0S pi+ and pi+ pi- effective mass projections of the Dalitz plot distributions. The large number (27) of non-zero amplitudes leads to a large number of parameters. The resulting model distributions and branching fractions are compared to the accurate Belle Collaboration data.

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