Chinese Physics C > 2013, Vol. 37 > Issue(1): 013103 DOI: 10.1088/1674-1137/37/1/013103

Pure annihilation type decays B⁰→D_s^-K₂^*+and B_s→Da₂in perturbative QCD approach

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We calculate the branching ratios of pure annihilation type decays B ⁰→D _s ^-K ₂ ^*+and B _s→ Da ₂using the perturbative QCD approach based on k _Tfactorization. The branching ratios are predicted to be (60.6 _{-16.5-10.4-2.1} ^{+17.3+4.3+3.2})× 10 ^-6for B ⁰→D _s ^-K ₂ ^*+, (1.1 _-0.4-0.2-0.1 ^+0.4+0.1+0.1)×10 ^-6for B _s→ D ⁰a ₂ ⁰and (2.3 _-0.8-0.4-0.1 ^+0.8+0.2+0.1)×10 ^-6for B _s→D ^-a ₂ ⁺. They are large enough to be measured in the ongoing experiment. Due to the shortage of contributions from penguin operators, there are no direct CPasymmetries 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 B ⁰→D _s ^-K ₂ ^*+and B _s→Da ₂in perturbative QCD approach[J]. Chinese Physics C, 2013, 37(1): 013103. doi: 10.1088/1674-1137/37/1/013103

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Received: 2012-04-16
Revised: 2012-04-28

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Pure annihilation type decays B⁰→D_s^-K₂^*+and B_s→Da₂in perturbative QCD approach

Received Date:2012-04-16

Accepted Date:2012-04-28

Available Online:2013-01-05

Abstract:We calculate the branching ratios of pure annihilation type decays B⁰→D_s^-K₂^*+and B_s→Da₂using the perturbative QCD approach based onk_Tfactorization. The branching ratios are predicted to be (60.6_{-16.5-10.4-2.1}^{+17.3+4.3+3.2})× 10^-6for B⁰→D_s^-K₂^*+, (1.1_-0.4-0.2-0.1^+0.4+0.1+0.1)×10^-6for B_s→D⁰a₂⁰and (2.3_-0.8-0.4-0.1^+0.8+0.2+0.1)×10^-6for B_s→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 directCPasymmetries 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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Pure annihilation type decays B⁰→D_s^-K₂^*+and B_s→Da₂in perturbative QCD approach

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