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Anatomy of the perturbative QCD approach to the baryonic decays Lambda b -> p pi, pK
Lv CD(吕才典); Wang YM(王玉明); Zou H(邹浩); Lu, CD; Wang, YM; Zou, H; Ali, A; Kramer, G
2009
发表期刊PHYSICAL REVIEW D
卷号80期号:3页码:34011
通讯作者[Lue, Cai-Dian ; Wang, Yu-Ming ; Zou, Hao] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Lue, Cai-Dian ; Wang, Yu-Ming ; Zou, Hao] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China ; [Ali, Ahmed] DESY, D-22607 Hamburg, Germany ; [Kramer, Gustav] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany
文章类型Article
摘要We calculate the CP-averaged branching ratios and CP-violating asymmetries for the two-body charmless hadronic decays Lambda(b) -> p pi, pK in the perturbative QCD (pQCD) approach to lowest order in alpha(s). The baryon distribution amplitudes involved in the factorization formulas are considered to the leading twist accuracy, and the distribution amplitudes of the proton are expanded to the next-to-leading conformal spin ( i. e., "P'' waves), the moments of which are determined from QCD sum rules. Our work shows that the contributions from the factorizable diagrams in Lambda(b) -> p pi, pK decays are much smaller compared to the nonfactorizable diagrams in the conventional pQCD approach. We argue that this reflects the estimates of the Lambda(b) -> p transition form factors in the k(T) factorization approach, which are found to be typically an order of magnitude smaller than those estimated in the light-cone sum rules and in the nonrelativistic quark model. As an alternative, we adopt a hybrid pQCD approach, in which we compute the factorizable contributions with the Lambda(b) -> p form factors taken from the light-cone QCD sum rules. The nonfactorizable diagrams are evaluated utilizing the conventional pQCD formalism, which is free from the endpoint singularities. The predictions worked out here are confronted with the recently available data from the CDF Collaboration on the branching ratios and the direct CP asymmetries for the decays Lambda(b) -> p pi and Lambda(b) -> pK . The asymmetry parameter alpha relevant for the anisotropic angular distribution of the emitted proton in the polarized Lambda(b) baryon decays is also calculated for the two decay modes.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.80.034011
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000269641100033
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被引频次:30[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240546
专题理论物理室
作者单位中国科学院高能物理研究所
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Lv CD,Wang YM,Zou H,et al. Anatomy of the perturbative QCD approach to the baryonic decays Lambda b -> p pi, pK[J]. PHYSICAL REVIEW D,2009,80(3):34011.
APA 吕才典.,王玉明.,邹浩.,Lu, CD.,Wang, YM.,...&Kramer, G.(2009).Anatomy of the perturbative QCD approach to the baryonic decays Lambda b -> p pi, pK.PHYSICAL REVIEW D,80(3),34011.
MLA 吕才典,et al."Anatomy of the perturbative QCD approach to the baryonic decays Lambda b -> p pi, pK".PHYSICAL REVIEW D 80.3(2009):34011.
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