| Semileptonic decays B_c■(η_c,J/ψ)l■_l in the “PQCD+Lattice” approach |
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| 引用本文： | 胡学卿,金苏平,肖振军.Semileptonic decays B_c■(η_c,J/ψ)l■_l in the “PQCD+Lattice” approach[J].中国物理C（英文版）,2020(2):51-61. |
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| 作者姓名： | 胡学卿 金苏平 肖振军 |
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| 作者单位： | Department of Physics and Institute of Theoretical Physics;Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems |
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| 基金项目： | Supported by the National Natural Science Foundation of China(11775117,11235005) |
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| 摘 要： | We study the semileptonic decaysBc-→(ηc,J/ψ)l-■lusing the PQCD factorization approach with the newly defined distribution amplitudes of the B c meson and a new kind of parametrization for extrapolating the form factors which takes into account the recent lattice QCD results.We find the following main results:(a)the PQCD predictions of the branching ratios of theBc→(ηc,J/ψ)l■decays are smaller by about 5%-16%when the lattice results are taken into account in the extrapolation of the relevant form factors;(b)the PQCD predictions of the ratio Rηc,RJ/ψand of the longitudinal polarization PτareRηc=0.34±0.01,RJ/ψ=0.28±0.01,Pτ(ηc)=0.37±0.01and Pτ(J/ψ)=-0.55±0.01;and(c)after including the lattice results,the theoretical predictions slightly change:Rηc=0.31±0.01,RJ/ψ=0.27±0.01,Pτ(ηc)=0.36±0.01andPτ(J/ψ)=-0.53±0.01.The theoretical predictions of RJ/ψagree with the measurements within the errors.The other predictions could be tested by the LHCb experiment in the near future.
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| 关 键 词： | semileptonic Bc decays PQCD approach lattice QCD results ratio of branching ratios longitudinal polarization |
Semileptonic decays B_c■(η_c,J/ψ)l■_l in the “PQCD+Lattice” approach |
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| Xue-Qing Hu,Su-Ping Jin,Zhen-Jun Xiao.Semileptonic decays B_c■(η_c,J/ψ)l■_l in the “PQCD+Lattice” approach[J].Chinese Physics C,2020(2):51-61. |
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| Authors: | Xue-Qing Hu Su-Ping Jin Zhen-Jun Xiao |
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| Institution: | (Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210023,China;Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems,Nanjing Normal University,Nanjing 210023,China) |
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| Abstract: | We study the semileptonic decaysBc-→（ηc,J/ψ）l-■lusing the PQCD factorization approach with the newly defined distribution amplitudes of the B c meson and a new kind of parametrization for extrapolating the form factors which takes into account the recent lattice QCD results.We find the following main results:（a）the PQCD predictions of the branching ratios of theBc→（ηc,J/ψ）l■ decays are smaller by about 5%-16%when the lattice results are taken into account in the extrapolation of the relevant form factors;（b）the PQCD predictions of the ratio Rηc,RJ/ψand of the longitudinal polarization PτareRηc=0.34±0.01,RJ/ψ=0.28±0.01,Pτ（ηc）=0.37±0.01and Pτ（J/ψ）=-0.55±0.01;and（c）after including the lattice results,the theoretical predictions slightly change:Rηc=0.31±0.01,RJ/ψ=0.27±0.01,Pτ（ηc）=0.36±0.01andPτ（J/ψ）=-0.53±0.01.The theoretical predictions of RJ/ψagree with the measurements within the errors.The other predictions could be tested by the LHCb experiment in the near future. |
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| Keywords: | semileptonic Bc decays PQCD approach lattice QCD results ratio of branching ratios longitudinal polarization |
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