Evidence for Exotic Hadron Contributions to Λ_{b}^{0}→J/ψpπ^{-} Decays



Aaij, R, Beteta, CA, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S
et al (show 734 more authors) (2016) Evidence for Exotic Hadron Contributions to Λ_{b}^{0}→J/ψpπ^{-} Decays. PHYSICAL REVIEW LETTERS, 117 (8). 082003-.

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Abstract

A full amplitude analysis of Λ_{b}^{0}→J/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 3  fb^{-1}. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ^{-}, either the P_{c}(4380)^{+} and P_{c}(4450)^{+}→J/ψp states, previously observed in Λ_{b}^{0}→J/ψpK^{-} decays, or the Z_{c}(4200)^{-}→J/ψπ^{-} state, previously reported in B^{0}→J/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 P_{c}(4380)^{+} and P_{c}(4450)^{+} production rates expected from their previous observation taking account of Cabibbo suppression.

Item Type: Article
Additional Information: Version updated to the published one. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-015.html
Uncontrolled Keywords: particle decays, particle production
Depositing User: Symplectic Admin
Date Deposited: 14 Sep 2016 10:59
Last Modified: 19 Jan 2023 07:30
DOI: 10.1103/PhysRevLett.117.082003
Open Access URL: https://arxiv.org/pdf/1606.06999v2.pdf
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003301