Speaker
Sheldon Stone
(Syracuse University (US))
Description
Observations of exotic structures in the j\psi p channel, that we refer to as pentaquark-charmonium states, in Lamda_b to j\psi p K^- decays are presented. The data sample corresponds to an integrated luminosity of 3 inverse femtobarns 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 all the angular and two-body mass distributions in the decay chain. To obtain a satisfactory fit of the structures seen in the j\psi p mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. We also discuss the related amplitude analysis that measured unambiguously the spin-parity of the Z_c(4430)^+ state that decays into psi' pi^+
| Oral or Poster Presentation | Oral |
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Author
Sheldon Stone
(Syracuse University (US))
