Rare decays of Lambda(b) -> Lambda plus gamma and Lambda(b) -> Lambda plus l(+)l(-) in the light-cone sum rules

	Rare decays of Lambda(b) -> Lambda plus gamma and Lambda(b) -> Lambda plus l(+)l(-) in the light-cone sum rules
	Wang YM(王玉明); Lv CD(吕才典); Wang, YM; Li, Y; Lu, CD
刊名	EUROPEAN PHYSICAL JOURNAL C
	2009
卷号	59 期号:4 页码:861-882
通讯作者	[Wang, Yu-Ming ; Lu, Cai-Dian] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Wang, Yu-Ming ; Lu, Cai-Dian] CAS, Sci Facil, Ctr Theoret Phys, Beijing 100049, Peoples R China ; [Li, Ying] Yantai Univ, Dept Phys, Yantai 264005, Peoples R China
英文摘要	The weak decays of Lambda(b) -> Lambda + gamma and Lambda(b) -> Lambda + l(+)l(-) are investigated in the standard model using the light-cone sum-rule approach. The higher-twist distribution amplitudes of the Lambda baryon to the leading conformal spin are included in the sum rules for the transition form factors. Our results indicate that the higher-twist distribution amplitudes almost have no influence on the transition form factor f(2)(q(2)) defined by the tensor current, while such corrections can have a significant impact on the form factors g2(q(2)) defined by a vector current. Two phenomenological models (COZ and FZOZ) for the wave function of the. baryon are also employed in the sum rules for comparison, which can give rise to form factors approximately five times larger than that in terms of conformal expansion. Utilizing the form factors calculated in LCSR, the physical observables like the decay rate, the polarization asymmetry and forward-backward asymmetry are analyzed for the decays of Lambda(b) -> Lambda gamma, Lambda l(+)l(-).
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000263508500011
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238627]
专题	高能物理研究所_理论物理室高能物理研究所_计算中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Wang YM,Lv CD,Wang, YM,et al. Rare decays of Lambda(b) -> Lambda plus gamma and Lambda(b) -> Lambda plus l(+)l(-) in the light-cone sum rules[J]. EUROPEAN PHYSICAL JOURNAL C,2009,59(4):861-882.
APA	王玉明,吕才典,Wang, YM,Li, Y,&Lu, CD.(2009).Rare decays of Lambda(b) -> Lambda plus gamma and Lambda(b) -> Lambda plus l(+)l(-) in the light-cone sum rules.EUROPEAN PHYSICAL JOURNAL C,59(4),861-882.
MLA	王玉明,et al."Rare decays of Lambda(b) -> Lambda plus gamma and Lambda(b) -> Lambda plus l(+)l(-) in the light-cone sum rules".EUROPEAN PHYSICAL JOURNAL C 59.4(2009):861-882.