Observation of a Narrow Pentaquark State, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>4312</mml:mn><mml:msup><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>, and of the Two-Peak Structure of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>P</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>4450</mml:mn><mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>+</mml:mo></mml:msup></mml:math>
R. AaijNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsC. Abellán BetetaPhysik-Institut, Universität Zürich, Zürich, SwitzerlandB. AdevaInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainM. AdinolfiH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomC. A. AidalaUniversity of Michigan, Ann Arbor, USA (associated with Syracuse University, Syracuse, New York, USA)S. AkarUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceP. AlbicoccoINFN Laboratori Nazionali di Frascati, Frascati, ItalyJ. AlbrechtFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyF. AlessioEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AlexanderSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomA. Alfonso AlberoICCUB, Universitat de Barcelona, Barcelona, SpainG. AlkhazovPetersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia, St.Petersburg, RussiaP. Álvarez CartelleImperial College London, London, United KingdomA. A. AlvesInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainS. AmatoUniversidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, BrazilY. AmhisLAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceL. AnINFN Sezione di Firenze, Firenze, ItalyL. AnINFN Sezione di Firenze, Firenze, ItalyG. AndreassiInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandM. AndreottiINFN Sezione di Ferrara, Ferrara, ItalyJ. E. AndrewsUniversity of Maryland, College Park, Maryland, USAF. ArchilliINFN Laboratori Nazionali di Frascati, Frascati, ItalyP. d’ArgentPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. Arnau RomeuAix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, FranceA. ArtamonovInstitute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, RussiaM. ArtusoSyracuse University, Syracuse, New York, USAK. ArzymatovYandex School of Data Analysis, Moscow, RussiaE. AslanidesAix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, FranceM. AtzeniPhysik-Institut, Universität Zürich, Zürich, SwitzerlandB. AudurierINFN Sezione di Cagliari, Monserrato, ItalyS. BachmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. J. BackDepartment of Physics, University of Warwick, Coventry, United KingdomS. BakerImperial College London, London, United KingdomV. BalaguraLAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceW. BaldiniEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. BaranovYandex School of Data Analysis, Moscow, RussiaR. J. BarlowSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomS. BarsukLAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceW. BarterImperial College London, London, United KingdomM. BartoliniINFN Sezione di Genova, Genova, ItalyF. BaryshnikovNational University of Science and Technology "MISIS", Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia]V. BatozskayaNational Center for Nuclear Research (NCBJ), Warsaw, PolandB. BatsukhSyracuse University, Syracuse, New York, USAA. BattigFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyV. BattistaInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandA. BayInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandF. BedeschiINFN Sezione di Pisa, Pisa, ItalyI. BediagaCentro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, BrazilA. BeiterSyracuse University, Syracuse, New York, USAL. J. BelNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsV. BelavinYandex School of Data Analysis, Moscow, RussiaN. BeliyUniversity of Chinese Academy of Sciences, Beijing, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)V. BelléeInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandN. BelloliINFN Sezione di Milano-Bicocca, Milano, ItalyK. BelousInstitute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, RussiaI. BelyaevInstitute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, RussiaE. Ben-HaimLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceG. BencivenniINFN Laboratori Nazionali di Frascati, Frascati, ItalyS. BensonNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsS. BeranekI. Physikalisches Institut, RWTH Aachen University, Aachen, GermanyA. BerezhnoyInstitute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, RussiaR. BernetPhysik-Institut, Universität Zürich, Zürich, SwitzerlandD. BerninghoffPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyE. BertholetLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceA. BertolinINFN Sezione di Padova, Padova, ItalyC. BetancourtPhysik-Institut, Universität Zürich, Zürich, SwitzerlandF. BettiINFN Sezione di Bologna, Bologna, ItalyM.-O. BettlerCavendish Laboratory, University of Cambridge, Cambridge, United KingdomM. van BeuzekomNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsIa. BezshyikoPhysik-Institut, Universität Zürich, Zürich, SwitzerlandS. BhasinH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomJ. BhomHenryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, PolandM. S. BiekerFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyS. BifaniUniversity of Birmingham, Birmingham, United KingdomP. BilloirLPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, FranceA. BirnkrautFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyA. BizzetiINFN Sezione di Firenze, Firenze, ItalyM. BjørnDepartment of Physics, University of Oxford, Oxford, United KingdomM. P. BlagoEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandT. BlakeDepartment of Physics, University of Warwick, Coventry, United KingdomF. BlancInstitute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandS. BluskSyracuse University, Syracuse, New York, USAD. BobulskaSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomV. BocciINFN Sezione di Roma La Sapienza, Roma, ItalyO. Boente GarcíaInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainT. BoettcherMassachusetts Institute of Technology, Cambridge, Massachusetts, USAA. BondarBudker Institute of Nuclear Physics (SB RAS), Novosibirsk, RussiaN. BondarPetersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia, St.Petersburg, RussiaS. BorghiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. BorisyakYandex School of Data Analysis, Moscow, RussiaM. BorsatoPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyM. BoubdirI. Physikalisches Institut, RWTH Aachen University, Aachen, GermanyT. J. V. BowcockOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomC. BozziEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. BraunPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyA. Brea RodríguezInstituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainM. BrodskiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. BrodzickaHenryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
2019lv
ABI
Annotatsiya
A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ_{b}^{0}→J/ψpK^{-} decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P_{c}(4440)^{+} and P_{c}(4457)^{+}, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σ_{c}^{+}D[over ¯]^{0} and Σ_{c}^{+}D[over ¯]^{*0} thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
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