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New results on exotic baryon resonances at LHCb

  • Center for High Energy Physics, Tsinghua University, Beijing 100084, China

Cite this: JUSTC, 2016, 46(7): 557-566
https://doi.org/10.3969/j.issn.0253-2778.2016.07.004
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  • Author Bio:

    ZHANG Liming (for the LHCb Collaboration): ZHANG Liming, male,born in 1979, PhD/associate professor. Research field: high energy physics. E-mail: liming.zhang@cern.ch

  • Received Date: November 29, 2015
  • Revised Date: April 19, 2016
  • Published Date: July 30, 2016
    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.
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