Abstract
A full amplitude analysis of decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV collisions, corresponding to an integrated luminosity of . A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations , either the and states, previously observed in decays, or the state, previously reported in decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the and production rates expected from their previous observation taking account of Cabibbo suppression.
- Received 22 June 2016
- Corrected 8 March 2017
- Corrected 24 August 2016
DOI:https://doi.org/10.1103/PhysRevLett.117.082003
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
© 2016 CERN, for the LHCb Collaboration
Physics Subject Headings (PhySH)
Corrections
8 March 2017
24 August 2016
Errata
Publisher’s Note: Evidence for Exotic Hadron Contributions to Decays [Phys. Rev. Lett. 117, 082003 (2016)]
R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 117, 109902 (2016)
Publisher’s Note: Evidence for Exotic Hadron Contributions to Decays [Phys. Rev. Lett. 117, 082003 (2016)]
R. Aaij and LHCb Collaboration
Phys. Rev. Lett. 118, 119901 (2017)
Synopsis
Pentaquark Discovery Confirmed
Published 18 August 2016
New results from the LHCb experiment confirm the 2015 discovery that quarks can combine into groups of five.
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