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The annihilation type diagrams are di cult to calculate in any kind of model or method. Encouraged by the successful calculation of pure annihilation type B decays in the perturbative QCD factorization approach, we calculate the pure annihilation type D→PP(V) decays in the perturbative QCD approach based on the kT factorization. Although the expansion parameter 1/mD is not very small, our leading order numerical results agree with the existing experimental data for most channels. We expect more accurate observation from experiments, which can help us learn about the dynamics of D meson weak decays. 相似文献
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We calculate the branching ratios of pure annihilation type decays B0→Ds- K2*+ and Bs→Da2 using the perturbative QCD approach based on kT factorization. The branching ratios are predicted to be (60.6-16.5-10.4-2.1+17.3+4.3+3.2 )× 10-6 for B0→Ds- K2*+, (1.1-0.4-0.2-0.1+0.4+0.1+0.1)×10-6 for Bs→D0a20 and (2.3-0.8-0.4-0.1+0.8+0.2+0.1)×10-6 for Bs→D-a2+. They are large enough to be measured in the ongoing experiment. Due to the shortage of contributions from penguin operators, there are no direct CP asymmetries for these decays in the Standard Model. We also derive simple relations among these decay channels to reduce theoretical uncertainties for the experiments to test the accuracy of theory and search of new physics signal. 相似文献
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We calculate the branching ratios of pure annihilation type decays B 0 →Ds- (K2*)+ and Bs → a2 using the perturbative QCD approach based on k T factorization. The branching ratios are predicted to be (60.6 +17.3+4.3+3.2 16.5 10.4 2.1 )× 10-6 for B0 →Ds- (K2*)+ , (1.1 +0.4+0.1+0.1-0.4-0.2-0.1 )×10-6 for Bs → 0a20 and (2.3 +0.8+0.2+0.1-0.8-0.4-0.1 )×10-6 for Bs→D-a2+ . They are large enough to be measured in the ongoing experiment. Due to the shortage of contributions from penguin operators, there are no direct CP asymmetries for these decays in the Standard Model. We also derive simple relations among these decay channels to reduce theoretical uncertainties for the experiments, to test the accuracy of theory, and to search for a signal of new physics. 相似文献
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