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Diquarks and the semileptonic decay of Lambda(b) in the hybrid scheme
Guo, P; Ke, HW; Li, XQ; Lu, CD; Wang, YM; Lv CD(吕才典); Wang YM(王玉明)
2007
发表期刊PHYSICAL REVIEW D
卷号75期号:5页码:54017
通讯作者Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China ; CCAST, World Lab, Beijing 100080, Peoples R China ; CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
文章类型Article
摘要In this work we use the heavy-quark-light-diquark picture to study the semileptonic decay Lambda(b)->Lambda(c)+l+(nu) over bar (l) in the so-called hybrid scheme. Namely, we apply the heavy quark effective theory (HQET) for larger q(2) (corresponding to small recoil), which is the invariant mass square of l+(nu) over bar, whereas the perturbative QCD approach for smaller q(2) to calculate the form factors. The turning point where we require the form factors derived in the two approaches to be connected, is chosen near rho(cut)=1.1. It is noted that the kinematic parameter rho which is usually adopted in the perturbative QCD approach, is in fact exactly the same as the recoil factor omega=v center dot v' used in HQET where v, v' are the four velocities of Lambda(b) and Lambda(c) respectively. We find that the final result is not very sensitive to the choice, so that it is relatively reliable. Moreover, we apply a proper numerical program within a small range around rho(cut) to make the connection sufficiently smooth and we parametrize the form factor by fitting the curve gained in the hybrid scheme. The expression and involved parameters can be compared with the ones gained by fitting the experimental data. In this scheme the end-point singularities do not appear at all. The calculated value is satisfactorily consistent with the data which is recently measured by the DELPHI collaboration within 2 standard deviations.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.75.054017
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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:000245333000030
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被引频次:14[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/311005/240667
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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Guo, P,Ke, HW,Li, XQ,et al. Diquarks and the semileptonic decay of Lambda(b) in the hybrid scheme[J]. PHYSICAL REVIEW D,2007,75(5):54017.
APA Guo, P.,Ke, HW.,Li, XQ.,Lu, CD.,Wang, YM.,...&王玉明.(2007).Diquarks and the semileptonic decay of Lambda(b) in the hybrid scheme.PHYSICAL REVIEW D,75(5),54017.
MLA Guo, P,et al."Diquarks and the semileptonic decay of Lambda(b) in the hybrid scheme".PHYSICAL REVIEW D 75.5(2007):54017.
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