New results on the baryon decay Lambda(b) -> Lambda(c) l(nu)over-bar(l) in heavy quark effective theory

	New results on the baryon decay Lambda(b) -> Lambda(c) l(nu)over-bar(l) in heavy quark effective theory
	贾宇;Jia, Y; Jugeau, F; Oliver, L
刊名	PHYSICAL REVIEW D
	2012
卷号	86 期号:1 页码:14002
英文摘要	The baryon differential spectrum of the baryon decay Lambda(b) -> Lambda(c) l (nu) over bar (l) will hopefully be measured in detail at LHCb. We obtain some new results on the form factors in the heavy quark expansion of Heavy Quark Effective Theory that can be useful in the interpretation of the data. We formulate a sum rule for the elastic subleading form factor A(w) at order 1/m(Q), that originates from the Lagrangian perturbation L-kin. In the sum rule appear only the intermediate states (j(P), j(P)) = (0(+,) 1/2(+)), entering also in the 1/m(Q)(2) correction to the axial form factor G(1)(w), that contributes to the differential rate at zero recoil w = 1. This result, together with another sum rule in the forward direction for vertical bar G(1)(1)vertical bar(2), allows to obtain a lower bound for the correction at zero recoil -delta((G1))(2)(1/m)(Q) in terms of the derivative A'(1) (1) and the slope rho(2)(Lambda) and curvature sigma(2)(Lambda) of the elastic Isgur-Wise function xi(Lambda) (w). Another theoretical implication is that A'(1) must vanish for some relation between rho(2)(Lambda) and sigma(2)(Lambda), as well as for rho(2)(Lambda) -> 0, establishing a nontrivial correlation between the leading IW function xi(Lambda) (w) and the subleading one A(w). A phenomenological estimation of these two functions allows to obtain a lower bound on -delta((G1))(2)(1/m)(Q)
学科主题	Astronomy & Astrophysics; Physics
收录类别	SCI
WOS记录号	WOS:000306192100003
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224485]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	贾宇；Jia, Y,Jugeau, F,Oliver, L. New results on the baryon decay Lambda(b) -> Lambda(c) l(nu)over-bar(l) in heavy quark effective theory[J]. PHYSICAL REVIEW D,2012,86(1):14002.
APA	贾宇；Jia, Y,Jugeau, F,&Oliver, L.(2012).New results on the baryon decay Lambda(b) -> Lambda(c) l(nu)over-bar(l) in heavy quark effective theory.PHYSICAL REVIEW D,86(1),14002.
MLA	贾宇；Jia, Y,et al."New results on the baryon decay Lambda(b) -> Lambda(c) l(nu)over-bar(l) in heavy quark effective theory".PHYSICAL REVIEW D 86.1(2012):14002.