B→(J/ψ,η_c)K decays in the perturbative QCD approach  

作　　者：刘新 张志清 肖振军 

机构地区：[1]Department of Physics and Institute of Theoretical Physics,Nanjing Normal University

出　　处：《Chinese Physics C》2010年第7期937-943,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10605012,10735080);Project on Graduate Students' Education and Innovation of Jiangsu Province (CX09B 297Z)

摘　　要：In this paper,we calculated the B →（J/ψ,ηc） K decays in the perturbative QCD（pQCD） factorization approach with the inclusion of the partial next-to-leading order（NLO） contributions. With the inclusion of the significant enhancement from the NLO vertex corrections,the NLO pQCD predictions for the branching ratios agree with the data within 2σ errors：Br（B0 → J/ψK0） = 5.2-＋32..58×10-4,Br（B＋ → J/ψK＋） = 5.6-＋32..79×10-4,Br（B0 →ηcK0） = 5.5-＋22..30 × 10-4,Br（B＋ →ηcK＋） = 5.9-＋22..51 × 10-4.In this paper,we calculated the B →（J/ψ,ηc） K decays in the perturbative QCD（pQCD） factorization approach with the inclusion of the partial next-to-leading order（NLO） contributions. With the inclusion of the significant enhancement from the NLO vertex corrections,the NLO pQCD predictions for the branching ratios agree with the data within 2σ errors：Br（B0 → J/ψK0） = 5.2-＋32..58×10-4,Br（B＋ → J/ψK＋） = 5.6-＋32..79×10-4,Br（B0 →ηcK0） = 5.5-＋22..30 × 10-4,Br（B＋ →ηcK＋） = 5.9-＋22..51 × 10-4.

关 键 词：B meson next-to-leading order corrections branching ratio perturbative QCD approach 

分 类 号：O572.243[理学—粒子物理与原子核物理]