The systematic study of B -> pi form factors in pQCD approach and its reliability

	The systematic study of B -> pi form factors in pQCD approach and its reliability
	Wei ZT(魏正涛); Yang MZ(杨茂志); Wei, ZT; Yang, MZ
刊名	NUCLEAR PHYSICS B
	2002
卷号	642 期号:1-2 页码:#REF!
通讯作者	Wei, ZT (reprint author), CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
英文摘要	The study of exclusive B decays in perturbative QCD are complicated by the endpoint problem. In order to perform the perturbative calculation, the Sudakov effects are introduced to regulate the endpoint singularity. We provide a systematic analysis with leading and next-to-leading twist corrections for B --> pi form factors in pQCD approach. The intrinsic transverse momentum dependence of hadronic wave function and threshold resummation effects are included in pQCD approach. There are two leading twist B meson distribution amplitudes (or generally wave functions) in general. The QCD equations of motion provide important constraints on B meson wave functions. The reliability of pQCD approach in B --> pi form factors is discussed. 70% of the result comes from the region alpha(s)(t)/pi < 0.2 and 38% comes from the region where the momentum transfer t greater than or equal to 1 GeV. The conceptual problems of pQCD approach are discussed in brief. Our conclusion is that pQCD approach in the present form cannot provide a precise prediction for B --> pi transition form factors. (C) 2002 Elsevier Science B.V. All rights reserved.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000178920400011
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/227278]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	Wei ZT,Yang MZ,Wei, ZT,et al. The systematic study of B -> pi form factors in pQCD approach and its reliability[J]. NUCLEAR PHYSICS B,2002,642(1-2):#REF!.
APA	魏正涛,杨茂志,Wei, ZT,&Yang, MZ.(2002).The systematic study of B -> pi form factors in pQCD approach and its reliability.NUCLEAR PHYSICS B,642(1-2),#REF!.
MLA	魏正涛,et al."The systematic study of B -> pi form factors in pQCD approach and its reliability".NUCLEAR PHYSICS B 642.1-2(2002):#REF!.