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 | Wang, W ; Li, RH; Lv CD(吕才典); Lu, CD; Yu, FS; Zou, ZT
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| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 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 |
| 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. |
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来源：高能物理研究所
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