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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
Source PublicationJOURNAL OF HIGH ENERGY PHYSICS
Issue5Pages:160
AbstractWe 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.
KeywordQCD Phenomenology NLO Computations
Subject AreaPhysics
DOI10.1007/JHEP05(2012)160
Indexed BySCI ; INSPIREHEP
WOS IDWOS:000305238600080
inspireid1116883
inspireURLhttps://inspirehep.net/literature/1116883
Citation statistics
Cited Times:24 [INSPIRE]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/224437
Collection理论物理室
Recommended Citation
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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