Journal of University of Science and Technology of China ›› 2016, Vol. 46 ›› Issue (7): 557-566.DOI: 10.3969/j.issn.0253-2778.2016.07.004
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ZHANG Liming (for the LHCb Collaboration)
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Abstract: Observation of exotic resonant structures decaying into J/ψp found in the LHCb experiment is discussed. Examination of the J/ψp system in Λ0b→J/ψK-p decays shows two states, each of which must be composed of at least cuud quarks, and are thus consistent with pentaquarks. The significance of each of these resonances is more than 9 standard deviations. Their masses are (4 380±8±29)MeV and (4 4498±17±25)MeV, and their corresponding widths are (205±18±86)MeV, and (39±5±19)MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
Key words: LHCb, exotic baryon, hidden-charmonium pentaquark
ZHANG Liming (for the LHCb Collaboration). New results on exotic baryon resonances at LHCb[J]. Journal of University of Science and Technology of China, 2016, 46(7): 557-566.
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URL: http://just-cn.ustc.edu.cn/EN/10.3969/j.issn.0253-2778.2016.07.004
http://just-cn.ustc.edu.cn/EN/Y2016/V46/I7/557
