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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)
2012
发表期刊JOURNAL OF HIGH ENERGY PHYSICS
期号5页码:160
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.
关键词QCD Phenomenology NLO Computations
学科领域Physics
DOI10.1007/JHEP05(2012)160
收录类别SCI
WOS记录号WOS:000305238600080
引用统计
被引频次:6[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
专题理论物理室
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GB/T 7714
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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