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arXiv 1001.5403hep-phhep-ex
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K* 共振对B -> pi pi K中直接CP破坏的影响

K* resonance effects on direct CP violation in B -> pi pi K

O. Leitner, J. -P. Dedonder, B. Loiseau, R. Kaminski

摘要:

带电和中性B衰变成两个带电π介子和一个带电或中性K介子内的QCD因子分解方案,其中包括强子化之前和之后的最终状态的相互作用进行了分析。利用目前已知的π介子-K介子奇异矢量和标量形状因子考虑了K*(892)和K*(1430)共振效应。在Lambda_QCD/m_b中计算了超前功率和强耦合常数中次超前阶的弱衰变振幅,其中包括硬散射和湮灭的贡献。这些弱终态相互作用的终点发散由两个复杂的参数控制,这两个复杂的参数是通过拟合现有的有效质量和螺旋角分布、CP不对称性和K*(892)分支比数据确定的。将预测的K*(1430)分支比和计算的直接CP破坏不对称性与Belle和BABAR协作数据进行比较。

英文摘要:

Charged and neutral B decays into two charged pions and a charged or a neutral kaon are analyzed within the QCD factorization scheme where final state interactions before and after hadronization are included. The K*(892) and K*(1430) resonance effects are taken into account using the presently known pion-Kaon strange vector and scalar form factors. The weak decay amplitudes, which are calculated at leading power in Lambda_QCD/m_b and at the next-to-leading order in the strong coupling constant, include the hard scattering and annihilation contributions. The end point divergences of these weak final state interactions are controlled by two complex parameters determined through a fit to the available effective mass and helicity angle distribution, CP asymmetry and K*(892) branching ratio data. The predicted K*(1430) branching ratios and the calculated direct CP violation asymmetries are compared to the Belle and BABAR Collaboration data.

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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