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

doi:10.1103/PhysRevLett.122.222001

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

Particle Physics Group

Research output: Contribution to journal › Article › peer-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 language	English
Article number	222001
Journal	Physical Review Letters
Volume	122
Early online date	5 Jun 2019
DOIs	https://doi.org/10.1103/PhysRevLett.122.222001
Publication status	Published - 7 Jun 2019

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Appleby, R., Borghi, S., Burr, C., De Capua, S., Dutta, D., Gersabeck, E., Gersabeck, M., Grillo, L., Hilton, M., Lafferty, G., Mcnab, A., Parkes, C., Sarpis, G., Williams, M., The LHCb Collaboration, Hidalgo Charman, R., Maguire, K., & Fitzpatrick, C. (2019). Observation of a Narrow Pentaquark State, P c ( 4312 ) + , and of the Two-Peak Structure of the P c ( 4450 ) +. Physical Review Letters, 122, Article 222001. https://doi.org/10.1103/PhysRevLett.122.222001

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

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.",

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

year = "2019",

month = jun,

day = "7",

doi = "10.1103/PhysRevLett.122.222001",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Appleby, R, Borghi, S, Burr, C, De Capua, S, Dutta, D, Gersabeck, E, Gersabeck, M, Grillo, L, Hilton, M, Lafferty, G, Mcnab, A, Parkes, C, Sarpis, G, Williams, M, The LHCb Collaboration, Hidalgo Charman, R, Maguire, K & Fitzpatrick, C 2019, 'Observation of a Narrow Pentaquark State, P c ( 4312 ) + , and of the Two-Peak Structure of the P c ( 4450 ) +', Physical Review Letters, vol. 122, 222001. https://doi.org/10.1103/PhysRevLett.122.222001

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T1 - Observation of a Narrow Pentaquark State, P c ( 4312 ) + , and of the Two-Peak Structure of the P c ( 4450 ) +

AU - Appleby, Robert

AU - Borghi, Silvia

AU - Burr, Christopher

AU - De Capua, Stefano

AU - Dutta, Deepanwita

AU - Gersabeck, Evelina

AU - Gersabeck, Marco

AU - Grillo, Lucia

AU - Hilton, Martha

AU - Lafferty, George

AU - Mcnab, Andrew

AU - Parkes, Christopher

AU - Sarpis, Gediminas

AU - Williams, Mark

AU - The LHCb Collaboration,

AU - Hidalgo Charman, Raoul

AU - Maguire, Kevin

AU - Fitzpatrick, Conor

PY - 2019/6/7

Y1 - 2019/6/7

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.122.222001

M3 - Article

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 222001

ER -

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

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