Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar
Li, ZH; Zhu, N; Fan, XJ; Huang, T;黄涛(理)
刊名JOURNAL OF HIGH ENERGY PHYSICS
2012
期号5页码:160
关键词QCD Phenomenology NLO Computations
学科分类Physics
DOI10.1007/JHEP05(2012)160
英文摘要We present a QCD study on B, D -> pi semileptonic transitions at zero momentum transfer and an estimate of magnitudes of the associated CKM matrix elements. Light cone sum rules (LCSRs) with chiral correlator are applied to calculate the form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0). We show that there is no twist-3 and-5 component involved in the light-cone expansions such that the resulting sum rules have a good convergence and offer an understanding of these form factors at twist-5 level. A detailed O(alpha(s)) computation is carried out in leading twist-2 approximation and the (MS) over bar masses are employed for the underlying heavy quarks. With the updated inputs and experimental data, we have f(+)(B ->pi)(0) = 0.28(-0.02)(+0.05) and vertical bar V-ub vertical bar = (3.4(-0.6)(+0.2)+/- 0.1 +/- 0.1) x 10(-3); f(+)(D ->pi)(0) = 0.62 +/- 0.03 and vertical bar V-cd vertical bar = 0.244 +/- 0.005 +/- 0.003 +/- 0.008. As a by-product, a numerical estimate for the decay constant f(D) is yielded as f(D) = 190(-11)(+12) MeV.
收录类别SCI
WOS记录号WOS:000305238600080
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224437
专题中国科学院高能物理研究所_理论物理室_期刊论文
中国科学院高能物理研究所_理论物理室
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Li, ZH,Zhu, N,Fan, XJ,et al. Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar[J]. JOURNAL OF HIGH ENERGY PHYSICS,2012(5):160.
APA Li, ZH,Zhu, N,Fan, XJ,&Huang, T;黄涛.(2012).Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar.JOURNAL OF HIGH ENERGY PHYSICS(5),160.
MLA Li, ZH,et al."Form factors f(+)(B ->pi)(0) and f(+)(D ->pi)(0) in QCD and determination of vertical bar V-ub vertical bar and vertical bar V-cd vertical bar".JOURNAL OF HIGH ENERGY PHYSICS .5(2012):160.
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