Evidence for Exotic Hadron Contributions to Λ_{b}
Phys Rev Lett
; 117(8): 082003, 2016 Aug 19.
Article
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| MEDLINE
| ID: mdl-27588849
ABSTRACT
A full amplitude analysis of Λ_{b}^{0}âJ/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 Nâpπ^{-}, either the P_{c}(4380)^{+} and P_{c}(4450)^{+}âJ/ψp states, previously observed in Λ_{b}^{0}âJ/ψpK^{-} decays, or the Z_{c}(4200)^{-}âJ/ψπ^{-} state, previously reported in B^{0}âJ/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.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2016
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Article
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Suiza