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Evidence for Exotic Hadron Contributions to Λb0J/ψpπ Decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 117, 082003 – Published 18 August 2016; Errata Phys. Rev. Lett. 117, 109902 (2016); Phys. Rev. Lett. 118, 119901 (2017)
Physics logo See Synopsis: Pentaquark Discovery Confirmed
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Abstract

A full amplitude analysis of Λb0J/ψpπ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3fb1. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations Npπ, either the Pc(4380)+ and Pc(4450)+J/ψp states, previously observed in Λb0J/ψpK decays, or the Zc(4200)J/ψπ state, previously reported in B0J/ψK+π 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 Pc(4380)+ and Pc(4450)+ production rates expected from their previous observation taking account of Cabibbo suppression.

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  • 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)

  1. Physical Systems
  1. Techniques
Particles & Fields

Corrections

8 March 2017

24 August 2016

Errata

Synopsis

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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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Model-Independent Evidence for J/ψp Contributions to Λb0J/ψpK Decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 117, 082002 (2016)

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Vol. 117, Iss. 8 — 19 August 2016

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