Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude

doi:10.1140/epjc/s10052-018-5551-4

	Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude
	Fu, HB; Wu, XG; Li, K; Zhong, T; Huang, T; 黄涛(理); Zhang, Y
刊名	EUROPEAN PHYSICAL JOURNAL C
	2018
卷号	78 期号:1 页码:76
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-018-5551-4
文献子类	Article
英文摘要	The B -> D transition form factor (TFF) f(+)(B -> D)(q(2)) is determined mainly by the D-meson leadingtwist distribution amplitude (DA), phi(2; D), if the proper chiral current correlation function is adopted within the light-cone QCD sum rules. It is therefore significant to make a comprehensive study of DA phi(2; D) and its impact on f(+)(B -> D)(q(2)). In this paper, we calculate the moments of phi(2; D) with the QCD sum rules under the framework of the background field theory. New sum rules for the leading-twist DA moments (D) up to fourth order and up to dimension-six condensates are presented. At the scale mu = 2 GeV, the values of the first four moments are: (D) = -0.418(-0.022)(+0.021), (D) = 0.289(-0.022)(+0.023), (D) = -0.178 +/- 0.010 and (D) = 0.142(-0.012)(+0.013). Basing on the values of (D) (n = 1, 2, 3, 4), a bettermodel of phi(2; D) is constructed. Applying this model for the TFF f(+)(B -> D)(q(2)) under the light cone sum rules, we obtain f(+)(B -> D)(0) = 0.673(-0.041)(+0.038) and f(+)(B -> D)(q (2)(max)) = 1.117(-0.054)(+0.051). The uncertainty off(+)(B -> D)(q(2)) from phi(2; D) is estimated and we find its impact should be taken into account, especially in low and central energy region. The branching ratio B(B -> Dl (v) over bar (l)) is calculated, which is consistent with experimental data.
电子版国际标准刊号	1434-6052
WOS关键词	RELATIVISTIC WAVE-EQUATIONS ; CONE SUM-RULES ; SEMILEPTONIC DECAYS ; BACKGROUND FIELDS ; LATTICE QCD ; MASS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000423799800001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285590]
专题	高能物理研究所_理论物理室
通讯作者	黄涛(理)
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Fu, HB,Wu, XG,Li, K,et al. Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude[J]. EUROPEAN PHYSICAL JOURNAL C,2018,78(1):76.
APA	Fu, HB.,Wu, XG.,Li, K.,Zhong, T.,Huang, T.,...&Zhang, Y.(2018).Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude.EUROPEAN PHYSICAL JOURNAL C,78(1),76.
MLA	Fu, HB,et al."Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude".EUROPEAN PHYSICAL JOURNAL C 78.1(2018):76.