Semileptonic decays B → D（＊） lv in the perturbative QCD factorization approach

In this paper, we study the B → D（＊）l -v1 semileptonic decays and calculate the branching ratios/3（B →D（＊）l-vl） and the ratios R（D（＊）） and RDl by employing the perturbative QCD （pQCD） factorization approach. We find that （a） for R（D） and R（D＊） ratios, the pQCD predictions are R（D） = 0.430-0.026＋0.02...

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Bibliographic Details
Published in:中国科学通报：英文版 2014 (2), p.125-132
Main Author: Ying-Ying Fan Wen-Fei Wang Shan Cheng Zhen-Jun Xiao
Format: Article
Language:English
Subjects:
QCD因子化
RDT
分支比
半轻子衰变
实验测量
微扰QCD
量子色动力学
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Summary:In this paper, we study the B → D（＊）l -v1 semileptonic decays and calculate the branching ratios/3（B →D（＊）l-vl） and the ratios R（D（＊）） and RDl by employing the perturbative QCD （pQCD） factorization approach. We find that （a） for R（D） and R（D＊） ratios, the pQCD predictions are R（D） = 0.430-0.026＋0.021, R（D＊） = 0.301 4- 0.013 and agree well with BaBar＇s measurements of R（D（＊））; （b） for the newly defined RDl and RDt ratios, the pQCD predictions are RDl =0.450-0.051＋0.064 and RDt 0.642-0.070＋0.081 which may be more sensitive to the QCD dynamics of the considered semileptonic decays than R（D（＊）） and should be tested by experimental measurements.
ISSN:1001-6538
1861-9541