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The systematic study of B -> pi form factors in pQCD approach and its reliability
Wei, ZT; Yang, MZ; Wei, ZT , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
2002
发表期刊NUCLEAR PHYSICS B
ISSN0550-3213
卷号642期号:40910页码:263-289
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.
部门归属CCAST, World Lab, Beijing 100080, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Inst High Energy Phys, Beijing 100039, Peoples R China
关键词Exclusive Semileptonic Decays Perturbative Qcd B->pi-pi Decays Cp Violation Meson Decays Heavy-quark Factorization Applicability Extraction Behavior
学科领域Physics
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收录类别SCI
WOS记录号WOS:000178920400011
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13414
专题理论物理所1978-2010年知识产出
通讯作者Wei, ZT , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
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Wei, ZT,Yang, MZ,Wei, ZT , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.. The systematic study of B -> pi form factors in pQCD approach and its reliability[J]. NUCLEAR PHYSICS B,2002,642(40910):263-289.
APA Wei, ZT,Yang, MZ,&Wei, ZT , CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China..(2002).The systematic study of B -> pi form factors in pQCD approach and its reliability.NUCLEAR PHYSICS B,642(40910),263-289.
MLA Wei, ZT,et al."The systematic study of B -> pi form factors in pQCD approach and its reliability".NUCLEAR PHYSICS B 642.40910(2002):263-289.
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