Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math>Resonances Consistent with Pentaquark States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mi>p</mml:mi></mml:mrow></mml:math>Decays
R. AaijEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandB. AdevaUniversidad de Santiago de Compostela, Santiago de Compostela, SpainM. AdinolfiH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomTony AffolderOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomZ. AjaltouniClermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. AkarCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceJ. 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 KingdomS. AliNikhef National Institute for Subatomic Physics, Amsterdam, The NetherlandsG. AlkhazovPetersburg Nuclear Physics Institute (PNPI), Gatchina, RussiaP. Álvarez CartelleImperial College London, London, United KingdomA. A. AlvesUniversity of Cincinnati, Cincinnati, Ohio, USAS. AmatoUniversidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, BrazilS. AmerioSezione INFN di Padova, Padova, ItalyY. AmhisLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceL. AnCenter for High Energy Physics, Tsinghua University, Beijing, ChinaJ. AndersonPhysik-Institut, Universität Zürich, Zürich, SwitzerlandG. AndreassiEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandM. AndreottiSezione INFN di Ferrara, Ferrara, ItalyJ. E. AndrewsUniversity of Maryland, College Park, Maryland, USAR. B. ApplebySchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomO. Aquines GutierrezMax-Planck-Institut für Kernphysik (MPIK), Heidelberg, GermanyF. ArchilliEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandP. d’ArgentPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyA. ArtamonovInstitute for High Energy Physics (IHEP), Protvino, RussiaM. ArtusoSyracuse University, Syracuse, New York, USAE. AslanidesCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceG. AuriemmaSezione INFN di Roma La Sapienza, Roma, ItalyM. BaalouchClermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. BachmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. J. BackDepartment of Physics, University of Warwick, Coventry, United KingdomA. BadalovUniversitat de Barcelona, Barcelona, SpainC. BaessoPontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil)W. BaldiniEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandR. J. BarlowSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomC. BarschelEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. BarsukLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceW. BarterEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandV. BatozskayaNational Center for Nuclear Research (NCBJ), Warsaw, PolandV. BattistaEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandA. BayEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandL. BeaucourtLAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, FranceJ. BeddowSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomF. BedeschiSezione INFN di Pisa, Pisa, ItalyI. BediagaCentro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, BrazilL. J. BelNikhef National Institute for Subatomic Physics, Amsterdam, The NetherlandsV. BelléeEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandN. BelloliSezione INFN di Milano Bicocca, Milano, ItalyI. BelyaevInstitute of Theoretical and Experimental Physics (ITEP), Moscow, RussiaE. Ben-HaimLPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, FranceG. BencivenniLaboratori Nazionali dell'INFN di Frascati, Frascati, ItalyS. BensonEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. BentonH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomR. BernetInstitute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, RussiaA. BertolinSezione INFN di Padova, Padova, ItalyM.-O. BettlerEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. van BeuzekomNikhef National Institute for Subatomic Physics, Amsterdam, The NetherlandsA. BieńPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyS. BifaniUniversity of Birmingham, Birmingham, United KingdomP. BilloirLPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, FranceT. BirdSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. BirnkrautFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyA. BizzetiSezione INFN di Firenze, Firenze, ItalyT. BlakeDepartment of Physics, University of Warwick, Coventry, United KingdomF. BlancEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. BlouwMax-Planck-Institut für Kernphysik (MPIK), Heidelberg, GermanyS. BluskSyracuse University, Syracuse, New York, USAV. BocciSezione INFN di Roma La Sapienza, Roma, ItalyA. BondarBudker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, RussiaN. BondarEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandW. BoniventoSezione INFN di Cagliari, Cagliari, ItalyS. BorghiSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomM. BorsatoLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceT. J. V. BowcockOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomE. BowenPhysik-Institut, Universität Zürich, Zürich, SwitzerlandC. BozziSezione INFN di Ferrara, Ferrara, ItalyS. BraunPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyM. BritschMax-Planck-Institut für Kernphysik (MPIK), Heidelberg, GermanyT. BrittonSyracuse University, Syracuse, New York, USAJ. BrodzickaSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomN. H. BrookH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomA. BurschePhysik-Institut, Universität Zürich, Zürich, SwitzerlandJ. BuytaertEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. CadedduSezione INFN di Cagliari, Cagliari, ItalyR. CalabreseSezione INFN di Ferrara, Ferrara, ItalyM. CalviSezione INFN di Milano Bicocca, Milano, ItalyM. Calvo GomezUniversitat de Barcelona, Barcelona, SpainP. CampanaLaboratori Nazionali dell'INFN di Frascati, Frascati, ItalyD. H. Cámpora PérezEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandL. CapriottiSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. CarboneSezione INFN di Bologna, Bologna, ItalyG. CarboniSezione INFN di Roma Tor Vergata, Roma, ItalyR. CardinaleSezione INFN di Genova, Genova, ItalyA. CardiniSezione INFN di Cagliari, Cagliari, ItalyP. CarnitiSezione INFN di Milano Bicocca, Milano, ItalyL. CarsonSchool of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomK. Carvalho AkibaEuropean Organization for Nuclear Research (CERN), Geneva, Switzerland
2015lv
ABI
Annotatsiya
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 second is narrower, with a mass of 4449.8±1.7±2.5 MeV and a width of 39±5±19 MeV. The preferred J^{P} assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
Hali tarjima qilinmagan
Identifikatorlar
Iqtiboslar va manbalar
4 ta iqtibos0 ta foydalanilgan manba