Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-

doi:10.1016/j.physletb.2017.02.003

	Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-
	Wang, W; Li, RH; Lv CD(吕才典); Lu, CD; Yu, FS; Zou, ZT
刊名	PHYSICS LETTERS B
	2017
卷号	767 页码:232-235
关键词	Doubly-heavy baryons Electro-weak decays Branching ratios W-exchange process
ISSN号	0370-2693
DOI	10.1016/j.physletb.2017.02.003
文献子类	Article
英文摘要	Doubly-heavy baryons, with two heavy and one light quarks, are expected to exist in QCD and their masses have been predicted in the quark model. However their existence is not well established so far in experiment. In this work, we explore the possibility of searching for Xi(bc) and Xi(+)(cc) ccin the W-exchange processes, Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c) -> (2520) K-. On the basis of perturbative calculations, we estimate the branching ratio of the first decay as BR(Xi(0)(bc)-> p(+) K-) approximate to 3.21 xR(f)(2)xR tau x10(-7), where R-f(R-tau) are the ratios of the decay constants (lifetimes) of Xi(0)(bc) and Lambda(0)(b). The branching ratio of Xi(+)(cc) -> Sigma(++)(c) (2520) K- is related to that of Lambda(+)(c)-> Delta(++) K-, and thereby a conjectured topology analysis leads to the range for the branching ratio as: BR(Xi(+)(cc) -> Sigma(++)(c)(2520) K-) is an element of[0.36%, 1.80%]. The decay Xi(+)(cc) -> Sigma(++)(c) (2520) K- would be reconstructed in the Lambda K-+(c)-pi(+) final state which is easy to access even at a hadron collider. Based on the two facts that abundant heavy quarks can be produced at a hadron collider like LHC, and the branching ratios of Xi(0)(bc)-> pK(-) and Xi(+)(cc) -> Sigma(++)(c) (2520) K- are sizable, we urge our experimental colleagues to perform a search at LHCb. This will presumably lead to the discovery of the Xi(bc) and Xi(+)(cc), and precision measurements of the branching ratios in the future are helpful to investigate their decay mechanism. (C) 2017 The Author(s). Published by Elsevier B.V.
电子版国际标准刊号	1873-2445
WOS关键词	RELATIVISTIC QUARK-MODEL ; CHARMED BARYONS ; HADRONIC PRODUCTION ; INTRINSIC CHARM ; SUM-RULES ; XI(CC) ; GENERATOR ; XI(BB) ; MASSES
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000397861700035
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284446]
专题	高能物理研究所_理论物理室高能物理研究所_实验物理中心
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, W,Li, RH,Lv CD,et al. Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-[J]. PHYSICS LETTERS B,2017,767:232-235.
APA	Wang, W,Li, RH,吕才典,Lu, CD,Yu, FS,&Zou, ZT.(2017).Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-.PHYSICS LETTERS B,767,232-235.
MLA	Wang, W,et al."Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-".PHYSICS LETTERS B 767(2017):232-235.