New results on exotic baryon resonances at LHCb

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.