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| DOI | 10.1016/j.scib.2021.02.030 |
| Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay | |
| LHCb Collaboration | |
| 发表日期 | 2021 |
| ISSN | 20959273 |
| 起始页码 | 1278 |
| 结束页码 | 1287 |
| 卷号 | 66期号:13 |
| 英文摘要 | First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis of Ξb-→J/ψΛK- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1σ including systematic uncertainties and look-elsewhere effect. Its mass and width are determined to be 4458.8±2.9-1.1+4.7MeV and 17.3±6.5-5.7+8.0MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Ξ- states, Ξ1690- and Ξ1820-, are seen for the first time in a Ξb- decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1, collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. © 2021 Science China Press |
| 关键词 | ExoticsParticle and resonance productionPentaquarkQCDQuarkoniumSpectroscopy |
| 英文关键词 | Amplitude analysis; Charmonium; Exotic; Invariant mass distribution; Particle and resonance production; Pentaquarks; QCD; Quarkonia; Systematic uncertainties; Uncertainty |
| 语种 | 英语 |
| 来源期刊 | Science Bulletin
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207455 |
| 推荐引用方式 GB/T 7714 | LHCb Collaboration. Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay[J],2021,66(13). |
| APA | LHCb Collaboration.(2021).Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay.Science Bulletin,66(13). |
| MLA | LHCb Collaboration."Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay".Science Bulletin 66.13(2021). |
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