Pure annihilation type decays B0→Ds- K2*+ and Bs→Da2 in perturbative QCD approach

  • We calculate the branching ratios of pure annihilation type decays B0→Ds- K2*+ and BsDa2 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 BsD0a20 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.
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ZOU Zhi-Tian, ZHOU Rui and LÜ Cai-Dian. Pure annihilation type decays B0→Ds- K2*+ and Bs→Da2 in perturbative QCD approach[J]. Chinese Physics C, 2013, 37(1): 013103. doi: 10.1088/1674-1137/37/1/013103
ZOU Zhi-Tian, ZHOU Rui and LÜ Cai-Dian. Pure annihilation type decays B0→Ds- K2*+ and Bs→Da2 in perturbative QCD approach[J]. Chinese Physics C, 2013, 37(1): 013103.  doi: 10.1088/1674-1137/37/1/013103 shu
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Received: 2012-04-16
Revised: 2012-04-28
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Pure annihilation type decays B0→Ds- K2*+ and Bs→Da2 in perturbative QCD approach

Abstract: We calculate the branching ratios of pure annihilation type decays B0→Ds- K2*+ and BsDa2 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 BsD0a20 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.

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