Form factors f(+)(B >pi)(0) and f(+)(D >pi)(0) in QCD and determination of vertical bar Vub vertical bar and vertical bar Vcd vertical bar  
Li, ZH; Zhu, N; Fan, XJ; Huang, T;黄涛(理)  
2012  
Source Publication  JOURNAL OF HIGH ENERGY PHYSICS 
Issue  5Pages:160 
Abstract  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 twist3 and5 component involved in the lightcone expansions such that the resulting sum rules have a good convergence and offer an understanding of these form factors at twist5 level. A detailed O(alpha(s)) computation is carried out in leading twist2 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 Vub 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 Vcd vertical bar = 0.244 +/ 0.005 +/ 0.003 +/ 0.008. As a byproduct, a numerical estimate for the decay constant f(D) is yielded as f(D) = 190(11)(+12) MeV. 
Keyword  QCD Phenomenology NLO Computations 
Subject Area  Physics 
DOI  10.1007/JHEP05(2012)160 
Indexed By  SCI ; INSPIREHEP 
WOS ID  WOS:000305238600080 
inspireid  1116883 
inspireURL  https://inspirehep.net/literature/1116883 
Citation statistics 
Cited Times:24 [INSPIRE]

Document Type  期刊论文 
Identifier  http://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 Vub vertical bar and vertical bar Vcd 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 Vub vertical bar and vertical bar Vcd 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 Vub vertical bar and vertical bar Vcd vertical bar".JOURNAL OF HIGH ENERGY PHYSICS .5(2012):160. 
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