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

文献类型：期刊论文

作者Li, Run-Hui1; Lu, Cai-Dian2,3; Wang, Wei4; Yu, Fu-Sheng5,6,7; Zou, Zhi-Tian8
刊名PHYSICS LETTERS B
出版日期2017-04-10
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
DOI10.1016/j.physletb.2017.02.003
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.
WOS关键词RELATIVISTIC QUARK-MODEL ; CHARMED BARYONS ; HADRONIC PRODUCTION ; INTRINSIC CHARM ; SUM-RULES ; XI(CC) ; GENERATOR ; XI(BB) ; MASSES
资助项目National Natural Science Foundation of China[11505098] ; National Natural Science Foundation of China[1164700375] ; National Natural Science Foundation of China[11347027] ; National Natural Science Foundation of China[11505083] ; National Natural Science Foundation of China[11575110] ; National Natural Science Foundation of China[11375208] ; National Natural Science Foundation of China[11521505] ; National Natural Science Foundation of China[11621131001] ; National Natural Science Foundation of China[11235005] ; National Natural Science Foundation of China[11655002] ; National Natural Science Foundation of China[11447032] ; Natural Science Foundation of Shanghai[15DZ2272100] ; Natural Science Foundation of Shanghai[15ZR1423100] ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Shanghai Key Laboratory for Particle Physics and Cosmology (SKLPPC) ; Natural Science Foundation of Shandong Province[ZR2014AQ013] ; Doctoral Scientific Research Foundation of Inner Mongolia University ; Young Thousand Talents Plan
WOS研究方向Astronomy & Astrophysics ; Physics
语种英语
WOS记录号WOS:000397861700035
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education ; Shanghai Key Laboratory for Particle Physics and Cosmology (SKLPPC) ; Natural Science Foundation of Shandong Province ; Doctoral Scientific Research Foundation of Inner Mongolia University ; Young Thousand Talents Plan
源URL[http://119.78.100.186/handle/113462/44419]  
专题中国科学院近代物理研究所
通讯作者Li, Run-Hui
作者单位1.Inner Mongolia Univ, Sch Phys Sci & Technol, Hohhot 010021, Peoples R China
2.Inst High Energy Phys, YuquanLu 19B, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Sch Phys, YuquanLu 19A, Beijing 100049, Peoples R China
4.Shanghai Jiao Tong Univ, INPAC, Dept Phys & Astron, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
5.Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
6.Lanzhou Univ, Res Ctr Hadron & CSR Phys, Lanzhou 730000, Peoples R China
7.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
8.Yantai Univ, Dept Phys, Yantai 264055, Peoples R China
推荐引用方式
GB/T 7714		 Li, Run-Hui,Lu, Cai-Dian,Wang, Wei,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 Li, Run-Hui,Lu, Cai-Dian,Wang, Wei,Yu, Fu-Sheng,&Zou, Zhi-Tian.(2017).Doubly-heavy baryon weak decays: Xi(0)(bc) -> pK(-) and Xi(+)(cc) -> Sigma(++)(c)(2520)K-.PHYSICS LETTERS B,767,232-235.
MLA Li, Run-Hui,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.

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