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

	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
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.
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000305238600080
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224437]
专题	高能物理研究所_理论物理室
推荐引用方式 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.