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Uncertainties of the B -> D transition form factor from the D-meson leading-twist distribution amplitude
Zhang, Y; Zhong, T; Wu, XG; Li, K; Fu, HB; Huang, T; 黄涛(理)
2018
Source PublicationEUROPEAN PHYSICAL JOURNAL C
ISSN1434-6044
EISSN1434-6052
Volume78Issue:1Pages:76
SubtypeArticle
AbstractThe 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.
DOI10.1140/epjc/s10052-018-5551-4
WOS KeywordRELATIVISTIC WAVE-EQUATIONS ; CONE SUM-RULES ; SEMILEPTONIC DECAYS ; BACKGROUND FIELDS ; LATTICE QCD ; MASS
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Particles & Fields
WOS IDWOS:000423799800001
ADS Bibcode2018EPJC...78...76Z
AXRIV CODE1709
inspireid1622286
Citation statistics
Cited Times:11 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285590
Collection理论物理室
Corresponding Author黄涛(理)
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Corresponding Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Zhang, Y,Zhong, T,Wu, XG,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 Zhang, Y.,Zhong, T.,Wu, XG.,Li, K.,Fu, HB.,...&黄涛.(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 Zhang, Y,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.
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