| DOI: | 10.1016/j.scib.2021.02.030
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| 论文题名: | Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay |
| 作者: | LHCb Collaboration
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| 刊名: | Science Bulletin
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| ISSN: | 20959273
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| 出版年: | 2021
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| 卷: | 66, 期:13 | | 起始页码: | 1278
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| 结束页码: | 1287
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| 语种: | 英语
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| 中文关键词: | Exotics
; Particle and resonance production
; Pentaquark
; QCD
; Quarkonium
; Spectroscopy
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| 英文关键词: | Amplitude analysis
; Charmonium
; Exotic
; Invariant mass distribution
; Particle and resonance production
; Pentaquarks
; QCD
; Quarkonia
; Systematic uncertainties
; Uncertainty
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| 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 |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/170299
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
LHCb Collaboration. Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb-→J/ψΛK- decay[J]. Science Bulletin,2021-01-01,66(13)
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