Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays

By L. C. R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, Federico Alessio, M. Alexander, S. Ali and 711 more. 2015

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Observations of exotic structures in the J/ψp channel, that we refer to as pentaquark-charmonium states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of 3/fb acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis is performed on the three-body final-state that 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ebef463f181fda3963bed62728944667dd62f929

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In Nuclear and High Energy Physics

Citations in the corpus

Hadronic molecules (2017, methodology): “Recently, LHCb reported two pentaquark-like structures Pc(4380) + and Pc(4450)+ in the J/ψp invariant mass distribution of Λb → J/ψpK− (Aaij et al., 2015b).”