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Observation of J/ψp resonances consistent with pentaquark states in Λb0→J/ψK−p decays
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LCHb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Crocombe, Andrew, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2015) Observation of J/ψp resonances consistent with pentaquark states in Λb0→J/ψK−p decays. Physical Review Letters, 115 (7). 072001 . doi:10.1103/PhysRevLett.115.072001 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.115.072001
Abstract
Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of 3 fb−1 acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380±8±29 MeV and a width of 205±18±86 MeV, while the second is narrower, with a mass of 4449.8±1.7±2.5 MeV and a width of 39±5±19 MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Quarks , Hadrons, Hadrons -- Decay | ||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review Letters | ||||||||||||||||||||||||||||||||||||
Publisher: | American Physical Society | ||||||||||||||||||||||||||||||||||||
ISSN: | 0031-9007 | ||||||||||||||||||||||||||||||||||||
Official Date: | 14 August 2015 | ||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 115 | ||||||||||||||||||||||||||||||||||||
Number: | 7 | ||||||||||||||||||||||||||||||||||||
Article Number: | 072001 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevLett.115.072001 | ||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 29 July 2019 | ||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 29 July 2019 | ||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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