Determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>Meson Quantum Numbers
R. AaijNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsC. Abellán BetetaUniversitat de Barcelona, Barcelona, SpainB. AdevaUniversidad de Santiago de Compostela, Santiago de Compostela, SpainM. AdinolfiH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomC. AdroverCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceTony AffolderOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomZ. AjaltouniClermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, 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, NetherlandsG. AlkhazovPetersburg Nuclear Physics Institute (PNPI), Gatchina, RussiaP. Álvarez CartelleUniversidad de Santiago de Compostela, Santiago de Compostela, SpainA. A. AlvesEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. 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. AnSezione INFN di Firenze, Firenze, ItalyJ. AndersonPhysik-Institut, Universität Zürich, Zürich, SwitzerlandR. AndreassenUniversity of Cincinnati, Cincinnati, Ohio, USA (associated with Syracuse University, Syracuse, New York, USA)R. B. ApplebySchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomO. Aquines GutierrezMax-Planck-Institut für Kernphysik (MPIK), Heidelberg, GermanyF. ArchilliLaboratori Nazionali dell’INFN di Frascati, Frascati, ItalyA. 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, ItalyS. BachmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. J. BackDepartment of Physics, University of Warwick, Coventry, United KingdomC. 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]V. BalaguraInstitute of Theoretical and Experimental Physics (ITEP), Moscow, RussiaW. BaldiniSezione INFN di Ferrara, Ferrara, ItalyR. 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. BarterCavendish Laboratory, University of Cambridge, Cambridge, United KingdomTh. BauerNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsA. BayEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. 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, BrazilS. BelogurovInstitute of Theoretical and Experimental Physics (ITEP), Moscow, RussiaK. BelousInstitute for High Energy Physics (IHEP), Protvino, RussiaI. BelyaevInstitute of Theoretical and Experimental Physics (ITEP), Moscow, RussiaE. Ben-HaimLPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, FranceM. BenayounLPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, FranceG. BencivenniLaboratori Nazionali dell’INFN di Frascati, Frascati, ItalyS. BensonSchool of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomJ. BentonH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomA. BerezhnoyInstitute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, RussiaR. BernetPhysik-Institut, Universität Zürich, Zürich, SwitzerlandM.-O. BettlerCavendish Laboratory, University of Cambridge, Cambridge, United KingdomM. van BeuzekomNikhef National Institute for Subatomic Physics, Amsterdam, NetherlandsA. BieńPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyS. BifaniSchool of Physics, University College Dublin, Dublin, IrelandT. BirdSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. BizzetiSezione INFN di Firenze, Firenze, ItalyP. M. BjørnstadSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomT. BlakeEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandF. BlancEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandJ. BlouwPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 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. BondarPetersburg Nuclear Physics Institute (PNPI), Gatchina, RussiaW. BoniventoSezione INFN di Cagliari, Cagliari, ItalyS. BorghiSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. BorgiaSyracuse University, Syracuse, New York, USAT. J. V. BowcockOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomE. BowenPhysik-Institut, Universität Zürich, Zürich, SwitzerlandC. BozziSezione INFN di Ferrara, Ferrara, ItalyT. BrambachFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyJ. F. J. van den BrandNikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, NetherlandsJ. BressieuxEcole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandD. BrettSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomM. BritschMax-Planck-Institut für Kernphysik (MPIK), Heidelberg, GermanyT. BrittonSyracuse University, Syracuse, New York, USAN. H. BrookH.H. Wills Physics Laboratory, University of Bristol, Bristol, United KingdomH. BrownOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomI. BurduceaHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaA. BurschePhysik-Institut, Universität Zürich, Zürich, SwitzerlandG. BusettoSezione INFN di Padova, Padova, ItalyJ. BuytaertEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandS. CadedduSezione INFN di Cagliari, Cagliari, ItalyO. CallotLAL, Université Paris-Sud, CNRS/IN2P3, Orsay, FranceM. CalviSezione INFN di Milano Bicocca, Milano, ItalyM. Calvo GomezUniversitat de Barcelona, Barcelona, SpainA. CamboniUniversitat de Barcelona, Barcelona, SpainP. CampanaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. 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, ItalyH. Carranza-MejiaSchool of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomL. CarsonImperial College London, London, United KingdomK. Carvalho AkibaUniversidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, BrazilG. CasseOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomM. CattaneoEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandCh. CauetFakultät Physik, Technische Universität Dortmund, Dortmund, GermanyM. CharlesDepartment of Physics, University of Oxford, Oxford, United Kingdom
2013lv
ABI
Annotatsiya
The quantum numbers of the $X(3872)$ meson are determined to be ${J}^{PC}={1}^{++}$ based on angular correlations in ${B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+}$ decays, where $X(3872)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ and $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The data correspond to $1.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements ${J}^{PC}={2}^{\ensuremath{-}+}$ is rejected with a confidence level equivalent to more than 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the $X(3872)$ state.
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