Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules

	Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules
	Wang YM(王玉明); Lv CD(吕才典); Wang, YM; Shen, YL; Lu, CD
刊名	PHYSICAL REVIEW D
	2009
卷号	80 期号:7 页码:74012
通讯作者	[Wang, Yu-Ming ; Lue, Cai-Dian] Inst High Energy Phys, Beijing 100049, Peoples R China ; [Wang, Yu-Ming ; Lue, Cai-Dian] Ctr Theoret Phys, Sci Facil, Beijing 100049, Peoples R China ; [Shen, Yue-Long] Acad Sinica, Inst Phys, Taipei 115, Taiwan ; [Shen, Yue-Long] Ocean Univ China, Coll Informat Sci & Engn, Qingdao 266100, Shandong, Peoples R China
英文摘要	Light-cone sum rules for the Lambda(b) -> p, Lambda transition form factors are derived from the correlation functions expanded by the twist of the distribution amplitudes of the Lambda(b) baryon. In terms of the Lambda(b) three-quark distribution amplitude models constrained by the QCD theory, we calculate the form factors at small momentum transfers and compare the results with those estimated in the conventional light-cone sum rules (LCSR) and perturbative QCD approaches. Our results indicate that the two different versions of sum rules can lead to the consistent numbers of form factors responsible for Lambda(b) -> p transition. The Lambda(b) -> Lambda transition form factors from LCSR with the asymptotic Lambda baryon distribution amplitudes are found to be almost 1 order larger than those obtained in the Lambda(b)-baryon LCSR, implying that the preasymptotic corrections to the baryonic distribution amplitudes are of great importance. Moreover, the SU(3) symmetry breaking effects between the form factors f(1)(Lambda b -> p) and f(1)(Lambda b ->Lambda) are computed as 28(-8)(+14)% in the framework of Lambda(b)-baryon LCSR.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000271353400042
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240783]
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. Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules[J]. PHYSICAL REVIEW D,2009,80(7):74012.
APA	王玉明,吕才典,Wang, YM,Shen, YL,&Lu, CD.(2009).Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules.PHYSICAL REVIEW D,80(7),74012.
MLA	王玉明,et al."Lambda b -> p, Lambda transition form factors from QCD light-cone sum rules".PHYSICAL REVIEW D 80.7(2009):74012.