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Resonant contribution of the three-body decay processb_(s)→K+K−P in perturbative QCD

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Chinese Physics C 2024年第1期48卷 29-39页

作者：吕刚张畅畅赵艳琳张丽英 College of Science Henan University of TechnologyZhengzhou 450001China

We investigate CP violation in the decay process b_(s)→ϕ(ρ,ω)P→K^(+)K^(-)P by considering the interference effects ofϕ→K^(+)K^(-),ρ→K^(+)K^(-),andω→K^(+)K^(-)within the framework of the perturbative QCD method(P refers toπ,K,η,andη′pseudoscalar mesons).We analyze the mixings ofϕ−ρ^(0),ϕ−ω,andω−ρ0 and provide the amplitudes of the quasi-two-body decay *** CP violation for the b_(s)→K^(+)K^(-)P decay process is obvious in the ranges of the three vector meson ***,the localized CP violation can be found to compare with the experimental results from the three-body decay process at the LHC in the near future.

关键词： heavy flavor physics CP violation b decay

Pure annihilation type b → K_0^(*±)(1430)K^((*)■) decays in the family non-universal Z’ model

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Chinese Physics C 2016年第1期40卷 28-36页

作者：李营王丹丹吕才典 Department of Physics Yantai University State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

by assuming that the scalar meson K＊0 （1430） belongs to the first excited states or the lowest lying ground states of qq＇, we study the pure annihilation-type decays b→K＊0±（1430）K（＊）（-/＋） in the QCD factorization approach. Within the Standard Model, the branching fractions are of the order of 10-8-10-7, which is possible to measure in the ongoing LHCb experiment or forthcoming belle-II experiment. We also study these decays in the family non-universal Z＇ model. The results show that if mZ＇≈600 GeV（ζ0.02）,both the branching fractions and CP asymmetries of -0b→K＊0±（1430）K-could be changed remarkably, which provides us with a place for probing the effect of new physics. These results could be used to constrain the parameters of the Zj model.

关键词： b decay CP asymmetry Z' model

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b→X_(s)γin bLMSSM

Chinese Physics C 2021年第5期45卷 39-48页

作者：陈建宾张梦邢丽丽冯太傅赵树民孙科盛 College of Physics and Optoelectronic Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Physics Hebei UniversityBaoding 071002China Department of Physics Baoding UniversityBaoding 071000.China

Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge *** on the parameters are investigated numerically with the experimental data for the branching ratioof b→X_(s)γAdditionally,we present the corrections to direct CP-violation in b→X_(s)γand time-de-pendent CP-asymmetry in b→K*γ.With appropriate assumptions on the parameters,we find the direct CP-viola-tion Acp is very small,while one-loop contributions to S K*γcan be significant.

关键词： bLMSSM electroweak radiative corrections b decay

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Pure annihilation type decays b0→Ds- K2＊＋ and bs→Da2 in perturbative QCD approach

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Chinese Physics C 2013年第1期37卷 32-35页

作者： ZOU Zhi-Tian ZHOU Rui LU Cai-Dian Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

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 to search for a signal of new physics.

关键词： b decay PQCD branching ratio

Pure annihilation type decays b~0→Ds~- (K2~*)~+ and bs →a2 in the perturbative QCD approach

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Chinese Physics C 2013年第1期37卷 32-35页

作者：邹芝田周锐吕才典 Institute of High Energy Physics Chinese Academy of Sciences

We calculate the branching ratios of pure annihilation type decays b 0 →Ds~- (K2~*)~+ and bs → a2using 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 )× 10-6for b~0 →Ds~- (K2~*)~+ , (1.1 +0.4+0.1+0.1-0.4-0.2-0.1 )×10-6 for bs → ~0a2~0 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.

关键词： b decay PQCD branching ratio