Observation of J/ψp Resonances Consistent with Pentaquark States in Λ0b→J/ψK−p Decays

LHCb collaboration

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Abstract / Description of output

Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of 3  fb−1 acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380±8±29  MeV and a width of 205±18±86  MeV, while the second is narrower, with a mass of 4449.8±1.7±2.5  MeV and a width of 39±5±19  MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
Original languageEnglish
Article number072001
Pages (from-to)1-15
Number of pages15
JournalPhysical Review Letters
Volume115
Early online date12 Aug 2015
DOIs
Publication statusPublished - 14 Aug 2015

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