Observation of a Narrow Pentaquark State, P c ( 4312 ) + , and of the Two-Peak Structure of the P c ( 4450 ) +

Robert Appleby, Silvia Borghi, Christopher Burr, Stefano De Capua, Deepanwita Dutta, Evelina Gersabeck, Marco Gersabeck, Lucia Grillo, Martha Hilton, George Lafferty, Andrew Mcnab, Christopher Parkes, Gediminas Sarpis, Mark Williams, The LHCb Collaboration, Raoul Hidalgo Charman, Kevin Maguire, Conor Fitzpatrick

Research output: Contribution to journalArticlepeer-review

Abstract

A narrow pentaquark state, Pc(4312)+, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ0b→J/ψpK− decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σ+c¯D0 and Σ+c¯D*0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

Original languageEnglish
Article number222001
JournalPhysical Review Letters
Volume122
Early online date5 Jun 2019
DOIs
Publication statusPublished - 7 Jun 2019

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