Observation of J / ψ p Resonances Consistent with Pentaquark States in Λ b 0 → J / ψ K − p Decays
European Organization for Nuclear Research · Universidade de Santiago de Compostela · +72 more institutions
Abstract
Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ_{b}^{0}→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…
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Authors
725Topics & keywords
- Physics
Funding
- NSNational Science FoundationAward: CNRS/IN2P3
- CCERN
- RSRoyal Society
- RCRoyal Commission for the Exhibition of 1851
- ECEuropean Commission
- DFDeutsche Forschungsgemeinschaft
- SNSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- SVStichting voor Fundamenteel Onderzoek der Materie
- NNNational Natural Science Foundation of ChinaAward: IN2P3
- RFRussian Foundation for Basic Research
- CDCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
- BFBundesministerium für Bildung und Forschung
- NONederlandse Organisatie voor Wetenschappelijk Onderzoek
- MDMinisterio de Economía y Competitividad
- CNConselho Nacional de Desenvolvimento Científico e Tecnológico
- MMax-Planck-Gesellschaft
- NCNarodowe Centrum Nauki
- MEMinisterstwo Edukacji i Nauki
- FCFundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- NANational Academy of Sciences of Ukraine
- CNCentre National de la Recherche ScientifiqueAward: CNRS/IN2P3
- FDFinanciadora de Estudos e Projetos
- SAScience and Technology Facilities CouncilAwards: ST/K00137X/1, ST/M004791/1, ST/K001604/1, ST/L003112/1, ST/J004855/1, ST/I000097/1, ST/L006146/1, ST/M000729/1, ST/M000761/1, LHCb, ST/L00352X/1, ST/M001474/1, ST/K001302/1, ST/M001407/1, PP/E000355/1, ST/L001195/1, ST/N000250/1, ST/K001310/1, ST/K001418/1, PP/E003095/1, IN2P3, ST/K004646/1, ST/J005495/1, ST/M004058/1, ST/L003392/1, ST/K001256/1, ST/H00100X/2, ST/J50094X/1, ST/K000705/1, ST/H00100X/1, LHCb Upgrades, ST/K003534/1, ST/I003576/1, ST/J004332/1, ST/L003538/1, GRIDPP, ST/H006737/1, ST/K00140X/1, ST/K003410/1, ST/N000447/1, ST/L003163/1
- EREuropean Research Council
- INInstituto Nazionale di Fisica Nucleare
- INInstitut National de Physique Nucléaire et de Physique des ParticulesAward: CNRS/IN2P3
- HMH2020 Marie Skłodowska-Curie Actions