Observation of J/psi p Resonances Consistent with Pentaquark States in Lambda(0)(b) -> J/psi K(-)p Decays
作者： R. Aaij , B. Adeva , M. Adinolfi , A. Affolder , Z. Ajaltouni
DOI: 10.1103/PHYSREVLETT.115.072001
关键词:
摘要: Observations of exotic structures in the J/ψp channel, that we refer to as pentaquark-charmonium states, Λ0b→J/ψK−p decays are presented. The data sample corresponds an integrated luminosity 3/fb acquired with LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis is performed on three-body final-state reproduces two-body mass angular distributions. To obtain a satisfactory fit seen spectrum, it necessary include two Breit-Wigner amplitudes each describe resonant state. significance these resonances more than 9 standard deviations. One has 4380±8±29 MeV width 205±18±86 MeV, while second narrower, 4449.8±1.7±2.5 39±5±19 MeV. preferred JP assignments opposite parity, one state having spin 3/2 other 5/2.
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