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Observation of sizeable ω contribution to χc1(3872)→π+π−J/ψ decays

R. Aaij32, A. S. W. Abdelmotteleb50, C. Abellan Beteta44, F. Abudinén50, T. Ackernley54, B. Adeva40, M. Adinolfi48, H. Afsharnia9, C. Agapopoulou13 et al. (LHCb Collaboration)

C. Agapopoulou13, C. A. Aidala77, S. Aiola25, Z. Ajaltouni9, S. Akar59, K. Akiba32, J. Albrecht15, F. Alessio42, M. Alexander53, A. Alfonso Albero39, Z. Aliouche56, P. Alvarez Cartelle49, S. Amato2, J. L. Amey48, Y. Amhis11, L. An42, L. Anderlini22, M. Andersson44, A. Andreianov38, M. Andreotti21, D. Ao6, F. Archilli17, A. Artamonov38, M. Artuso62, K. Arzymatov38, E. Aslanides10, M. Atzeni44, B. Audurier12, S. Bachmann17, M. Bachmayer43, J. J. Back50, A. Bailly-reyre13, P. Baladron Rodriguez40, V. Balagura12, W. Baldini21, J. Baptista de Souza Leite1, M. Barbetti22,b, R. J. Barlow56, S. Barsuk11, W. Barter55, M. Bartolini49, F. Baryshnikov38, J. M. Basels14, G. Bassi29,c, B. Batsukh4, A. Battig15, A. Bay43, A. Beck50, M. Becker15, F. Bedeschi29, I. B. Bediaga1, A. Beiter62, V. Belavin38, S. Belin27, V. Bellee44, K. Belous38, I. Belov38, I. Belyaev38, G. Bencivenni23, E. Ben-Haim13, A. Berezhnoy38, R. Bernet44, D. Berninghoff17, H. C. Bernstein62, C. Bertella56, A. Bertolin28, C. Betancourt44, F. Betti42, Ia. Bezshyiko44, S. Bhasin48, J. Bhom35, L. Bian67, M. S. Bieker15, N. V. Biesuz21, S. Bifani47, P. Billoir13, A. Biolchini32, M. Birch55, F. C. R. Bishop49, A. Bitadze56, A. Bizzeti, M. Bjørn57, M. P. Blago49, T. Blake50, F. Blanc43, S. Blusk62, D. Bobulska53, J. A. Boelhauve15, O. Boente Garcia40, T. Boettcher59, A. Boldyrev38, N. Bondar38,42, S. Borghi56, M. Borisyak38, M. Borsato17, J. T. Borsuk35, S. A. Bouchiba43, T. J. V. Bowcock54,42, A. Boyer42, C. Bozzi21, M. J. Bradley55, S. Braun60, A. Brea Rodriguez40, J. Brodzicka35, A. Brossa Gonzalo50, D. Brundu27, A. Buonaura44, L. Buonincontri28, A. T. Burke56, C. Burr42, A. Bursche66, A. Butkevich38, J. S. Butter32, J. Buytaert42, W. Byczynski42, S. Cadeddu27, H. Cai67, R. Calabrese21,d, L. Calefice15,13, S. Cali23, R. Calladine47, M. Calvi26,e, M. Calvo Gomez75, P. Camargo Magalhaes48, P. Campana23, A. F. Campoverde Quezada6, S. Capelli26,e, L. Capriotti20,f, A. Carbone20,f, G. Carboni31, R. Cardinale24,g, A. Cardini27, I. Carli4, P. Carniti26,e, L. Carus14, A. Casais Vidal40, R. Caspary17, G. Casse54, M. Cattaneo42, G. Cavallero42, V. Cavallini21,d, S. Celani43, J. Cerasoli10, D. Cervenkov57, A. J. Chadwick54, M. G. Chapman48, M. Charles13, Ph. Charpentier42, C. A. Chavez Barajas54, M. Chefdeville8, C. Chen3, S. Chen4, A. Chernov35, V. Chobanova40, S. Cholak43, M. Chrzaszcz35, A. Chubykin38, V. Chulikov38, P. Ciambrone23, M. F. Cicala50, X. Cid Vidal40, G. Ciezarek42, G. Ciullo21,d, P. E. L. Clarke52, M. Clemencic42, H. V. Cliff49, J. Closier42, J. L. Cobbledick56, V. Coco42, J. A. B. Coelho11, J. Cogan10, E. Cogneras9, L. Cojocariu37, P. Collins42, T. Colombo42, L. Congedo19,h, A. Contu27, N. Cooke47, G. Coombs53, I. Corredoira40, G. Corti42, C. M. Costa Sobral50, B. Couturier42, D. C. Craik58, J. Crkovská61, M. Cruz Torres1,i, R. Currie52, C. L. Da Silva61, S. Dadabaev38, L. Dai65, E. Dall’Occo15, J. Dalseno40, C. D’Ambrosio42, A. Danilina38, P. d’Argent42, J. E. Davies56, A. Davis56, O. De Aguiar Francisco56, J. de Boer42, K. De Bruyn73, S. De Capua56, M. De Cian43, U. De Freitas Carneiro Da Graca1, E. De Lucia23, J. M. De Miranda1, L. De Paula2, M. De Serio19,h, D. De Simone44, P. De Simone23, F. De Vellis15, J. A. de Vries74, C. T. Dean61, F. Debernardis19,h, D. Decamp8, V. Dedu10, L. Del Buono13, B. Delaney49, H.-P. Dembinski15, V. Denysenko44, O. Deschamps9, F. Dettori27,j, B. Dey71, A. Di Cicco23, P. Di Nezza23, S. Didenko38, L. Dieste Maronas40, H. Dijkstra42, V. Dobishuk46, C. Dong3, A. M. Donohoe18, F. Dordei27, A. C. dos Reis1, L. Douglas53, A. G. Downes8, M. W. Dudek35, L. Dufour42, V. Duk72, P. Durante42, J. M. Durham61, D. Dutta56, A. Dziurda35, A. Dzyuba38, S. Easo51, U. Egede63, V. Egorychev38, S. Eidelman38,a, S. Eisenhardt52, S. Ek-In43, L. Eklund76, S. Ely62, A. Ene37, E. Epple61, S. Escher14, J. Eschle44, S. Esen44, T. Evans56, L. N. Falcao1, Y. Fan6, B. Fang67, S. Farry54, D. Fazzini26,e, M. Feo42, A. Fernandez Prieto40, C. Fernandez-Ramirez62,k, A. D. Fernez60, F. Ferrari20, L. Ferreira Lopes43, F. Ferreira Rodrigues2, S. Ferreres Sole32, M. Ferrillo44, M. Ferro-Luzzi42, S. Filippov38, R. A. Fini19, M. Fiorini21,d, M. Firlej34, K. M. Fischer57, D. S. Fitzgerald77, C. Fitzpatrick56, T. Fiutowski34, F. Fleuret12, M. Fontana13, F. Fontanelli24,g, R. Forty42, D. Foulds-Holt49, V. Franco Lima54, M. Franco Sevilla60, M. Frank42, E. Franzoso21,d, G. Frau17, C. Frei42, D. A. Friday53, J. Fu6, Q. Fuehring15, E. Gabriel32, G. Galati19,h, A. Gallas Torreira40, D. Galli20,f, S. Gambetta52,42, Y. Gan3, M. Gandelman2, P. Gandini25, Y. Gao5, M. Garau27,j, L. M. Garcia Martin50, P. Garcia Moreno39, J. García Pardiñas26,e, B. Garcia Plana40, F. A. Garcia Rosales12, L. Garrido39, C. Gaspar42, R. E. Geertsema32, D. Gerick17, L. L. Gerken15, E. Gersabeck56, M. Gersabeck56, T. Gershon50, D. Gerstel10, L. Giambastiani28, V. Gibson49, H. K. Giemza36, A. L. Gilman57, M. Giovannetti23,l, A. Gioventù40, P. Gironella Gironell39, C. Giugliano21,d, K. Gizdov52, E. L. Gkougkousis42, V. V. Gligorov13,42, C. Göbel64, E. Golobardes75, D. Golubkov38, A. Golutvin55,38, A. Gomes1,m, S. Gomez Fernandez39, F. Goncalves Abrantes57, M. Goncerz35, G. Gong3, I. V. Gorelov38, C. Gotti26, J. P. Grabowski17, T. Grammatico13, L. A. Granado Cardoso42, E. Graugés39, E. Graverini43, G. Graziani, A. T. Grecu37, L. M. Greeven32, N. A. Grieser4, L. Grillo56, S. Gromov38, B. R. Gruberg Cazon57, C. Gu3, M. Guarise21,d, M. Guittiere11, P. A. Günther17, E. Gushchin38, A. Guth14, Y. Guz38, T. Gys42, T. Hadavizadeh63, G. Haefeli43, C. Haen42, J. Haimberger42, S. C. Haines49, T. Halewood-leagas54, M. M. Halvorsen42, P. M. Hamilton60, J. Hammerich54, Q. Han7, X. Han17, E. B. Hansen56, S. Hansmann-Menzemer17, L. Hao6, N. Harnew57, T. Harrison54, C. Hasse42, M. Hatch42, J. He6,n, M. Hecker55, K. Heijhoff32, K. Heinicke15, R. D. L. Henderson63,50, A. M. Hennequin42, K. Hennessy54, L. Henry42, J. Heuel14, A. Hicheur2, D. Hill43, M. Hilton56, S. E. Hollitt15, R. Hou7, Y. Hou8, J. Hu17, J. Hu66, W. Hu7, X. Hu3, W. Huang6, X. Huang67, W. Hulsbergen32, R. J. Hunter50, M. Hushchyn38, D. Hutchcroft54, D. Hynds32, P. Ibis15, M. Idzik34, D. Ilin38, P. Ilten59, A. Inglessi38, A. Ishteev38, K. Ivshin38, R. Jacobsson42, H. Jage14, S. Jakobsen42, E. Jans32, B. K. Jashal41, A. Jawahery60, V. Jevtic15, X. Jiang4,6, M. John57, D. Johnson58, C. R. Jones49, T. P. Jones50, B. Jost42, N. Jurik42, S. Kandybei45, Y. Kang3, M. Karacson42, D. Karpenkov38, M. Karpov38, J. W. Kautz59, F. Keizer42, D. M. Keller62, M. Kenzie50, T. Ketel33, B. Khanji15, A. Kharisova38, S. Kholodenko38, T. Kirn14, V. S. Kirsebom43, O. Kitouni58, S. Klaver33, N. Kleijne29,c, K. Klimaszewski36, M. R. Kmiec36, S. Koliiev46, A. Kondybayeva38, A. Konoplyannikov38, P. Kopciewicz34, R. Kopecna17, P. Koppenburg32, M. Korolev38, I. Kostiuk32,46, O. Kot46, S. Kotriakhova, A. Kozachuk38, P. Kravchenko38, L. Kravchuk38, R. D. Krawczyk42, M. Kreps50, S. Kretzschmar14, P. Krokovny38, W. Krupa34, W. Krzemien36, J. Kubat17, W. Kucewicz35,34, M. Kucharczyk35, V. Kudryavtsev38, H. S. Kuindersma32, G. J. Kunde61, T. Kvaratskheliya38, D. Lacarrere42, G. Lafferty56, A. Lai27, A. Lampis27,j, D. Lancierini44, J. J. Lane56, R. Lane48, G. Lanfranchi23, C. Langenbruch14, J. Langer15, O. Lantwin38, T. Latham50, F. Lazzari29,o, M. Lazzaroni25,p, R. Le Gac10, S. H. Lee77, R. Lefèvre9, A. Leflat38, S. Legotin38, P. Lenisa21,d, O. Leroy10, T. Lesiak35, B. Leverington17, H. Li66, P. Li17, S. Li7, Y. Li4, Z. Li62, X. Liang62, T. Lin55, R. Lindner42, V. Lisovskyi15, R. Litvinov27,j, G. Liu66, H. Liu6, Q. Liu6, S. Liu4,6, A. Lobo Salvia39, A. Loi27, R. Lollini72, J. Lomba Castro40, I. Longstaff53, J. H. Lopes2, S. López Soliño40, G. H. Lovell49, Y. Lu4,q, C. Lucarelli22,b, D. Lucchesi28,r, S. Luchuk38, M. Lucio Martinez32, V. Lukashenko32,46, Y. Luo3, A. Lupato56, E. Luppi21,d, O. Lupton50, A. Lusiani29,c, X.-R. Lyu6, L. Ma4, R. Ma6, S. Maccolini20, F. Machefert11, F. Maciuc37, V. Macko43, P. Mackowiak15, S. Maddrell-Mander48, L. R. Madhan Mohan48, A. Maevskiy38, D. Maisuzenko38, M. W. Majewski34, J. J. Malczewski35, S. Malde57, B. Malecki35, A. Malinin38, T. Maltsev38, H. Malygina17, G. Manca27,j, G. Mancinelli10, D. Manuzzi20, D. Marangotto25,p, J. F. Marchand8, U. Marconi20, S. Mariani22,b, C. Marin Benito42, M. Marinangeli43, J. Marks17, A. M. Marshall48, P. J. Marshall54, G. Martelli72,s, G. Martellotti30, L. Martinazzoli42,e, M. Martinelli26,e, D. Martinez Santos40, F. Martinez Vidal41, A. Massafferri1, M. Materok14, R. Matev42, A. Mathad44, V. Matiunin38, C. Matteuzzi26, K. R. Mattioli77, A. Mauri32, E. Maurice12, J. Mauricio39, M. Mazurek42, M. McCann55, L. Mcconnell18, T. H. McGrath56, N. T. McHugh53, A. McNab56, R. McNulty18, J. V. Mead54, B. Meadows59, G. Meier15, D. Melnychuk36, S. Meloni26,e, M. Merk32,74, A. Merli25,p, L. Meyer Garcia2, M. Mikhasenko69,t, D. A. Milanes68, E. Millard50, M. Milovanovic42, M.-N. 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Panshin38, A. Papanestis51, M. Pappagallo19,h, L. L. Pappalardo21,d, C. Pappenheimer59, W. Parker60, C. Parkes56, B. Passalacqua21,d, G. Passaleva22, A. Pastore19, M. Patel55, C. Patrignani20,f, C. J. Pawley74, A. Pearce42, A. Pellegrino32, M. Pepe Altarelli42, S. Perazzini20, D. Pereima38, A. Pereiro Castro40, P. Perret9, M. Petric53, K. Petridis48, A. Petrolini24,g, A. Petrov38, S. Petrucci52, M. Petruzzo25, H. Pham62, A. Philippov38, R. Piandani6, L. Pica29,c, M. Piccini72, B. Pietrzyk8, G. Pietrzyk11, M. Pili57, A. Pilloni62,u, D. Pinci30, F. Pisani42, M. Pizzichemi26,42,e, V. Placinta37, J. Plews47, M. Plo Casasus40, F. Polci13,42, M. Poli Lener23, M. Poliakova62, A. Poluektov10, N. Polukhina38, I. Polyakov62, E. Polycarpo2, S. Ponce42, D. Popov6,42, S. Popov38, S. Poslavskii38, K. Prasanth35, L. Promberger42, C. Prouve40, V. Pugatch46, V. Puill11, G. Punzi29,v, H. R. Qi3, W. Qian6, N. Qin3, R. Quagliani43, N. V. Raab18, R. I. Rabadan Trejo6, B. Rachwal34, J. H. Rademacker48, R. Rajagopalan62, M. Rama29, M. Ramos Pernas50, M. S. Rangel2, F. Ratnikov38, G. Raven33,42, M. Reboud8, F. Redi42, F. Reiss56, C. Remon Alepuz41, Z. Ren3, V. Renaudin57, P. K. Resmi10, R. Ribatti29,c, A. M. Ricci27, S. Ricciardi51, K. Rinnert54, P. Robbe11, G. Robertson52, A. B. Rodrigues43, E. Rodrigues54, J. A. Rodriguez Lopez68, E. Rodriguez Rodriguez40, A. Rollings57, P. Roloff42, V. Romanovskiy38, M. Romero Lamas40, A. Romero Vidal40, J. D. Roth77,a, M. Rotondo23, M. S. Rudolph62, T. Ruf42, R. A. Ruiz Fernandez40, J. Ruiz Vidal41, A. Ryzhikov38, J. Ryzka34, J. J. Saborido Silva40, N. Sagidova38, N. Sahoo47, B. Saitta27,j, M. Salomoni42, C. Sanchez Gras32, R. Santacesaria30, C. Santamarina Rios40, M. Santimaria23, E. Santovetti31,l, D. Saranin38, G. Sarpis14, M. Sarpis69, A. Sarti30, C. Satriano30,w, A. Satta31, M. Saur15, D. Savrina38, H. Sazak9, L. G. Scantlebury Smead57, A. Scarabotto13, S. Schael14, S. Scherl54, M. Schiller53, H. Schindler42, M. Schmelling16, B. Schmidt42, S. 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Zhovkovska11, X. Zhu3, X. Zhu7, Z. Zhu6, V. Zhukov14,38, Q. Zou4,6, S. Zucchelli20,f, D. Zuliani28, and G. Zunica56 (LHCb Collaboration)

  • 1Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
  • 2Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
  • 3Center for High Energy Physics, Tsinghua University, Beijing, China
  • 4Institute Of High Energy Physics (IHEP), Beijing, China
  • 5School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
  • 6University of Chinese Academy of Sciences, Beijing, China
  • 7Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
  • 8Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
  • 9Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
  • 10Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
  • 11Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • 12Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
  • 13LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
  • 14I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
  • 15Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
  • 16Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
  • 17Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 18School of Physics, University College Dublin, Dublin, Ireland
  • 19INFN Sezione di Bari, Bari, Italy
  • 20INFN Sezione di Bologna, Bologna, Italy
  • 21INFN Sezione di Ferrara, Ferrara, Italy
  • 22INFN Sezione di Firenze, Firenze, Italy
  • 23INFN Laboratori Nazionali di Frascati, Frascati, Italy
  • 24INFN Sezione di Genova, Genova, Italy
  • 25INFN Sezione di Milano, Milano, Italy
  • 26INFN Sezione di Milano-Bicocca, Milano, Italy
  • 27INFN Sezione di Cagliari, Monserrato, Italy
  • 28Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy
  • 29INFN Sezione di Pisa, Pisa, Italy
  • 30INFN Sezione di Roma La Sapienza, Roma, Italy
  • 31INFN Sezione di Roma Tor Vergata, Roma, Italy
  • 32Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
  • 33Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
  • 34AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
  • 35Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
  • 36National Center for Nuclear Research (NCBJ), Warsaw, Poland
  • 37Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
  • 38Affiliated with an institute covered by a cooperation agreement with CERN
  • 39ICCUB, Universitat de Barcelona, Barcelona, Spain
  • 40Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
  • 41Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
  • 42European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • 43Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • 44Physik-Institut, Universität Zürich, Zürich, Switzerland
  • 45NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
  • 46Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
  • 47University of Birmingham, Birmingham, United Kingdom
  • 48H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
  • 49Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
  • 50Department of Physics, University of Warwick, Coventry, United Kingdom
  • 51STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
  • 52School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
  • 53School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
  • 54Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
  • 55Imperial College London, London, United Kingdom
  • 56Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
  • 57Department of Physics, University of Oxford, Oxford, United Kingdom
  • 58Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
  • 59University of Cincinnati, Cincinnati, Ohio, USA
  • 60University of Maryland, College Park, Maryland, USA
  • 61Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
  • 62Syracuse University, Syracuse, New York, USA
  • 63School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom)
  • 64Pontifícia 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)
  • 65Physics and Micro Electronic College, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
  • 66Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
  • 67School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
  • 68Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
  • 69Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
  • 70Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
  • 71Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
  • 72INFN Sezione di Perugia, Perugia, Italy (associated with INFN Sezione di Ferrara, Ferrara, Italy)
  • 73Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 74Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 75DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)
  • 76Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
  • 77University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)

  • *Full author list given at the end of the article.
  • aDeceased.
  • bAlso at Università di Firenze, Firenze, Italy.
  • cAlso at Scuola Normale Superiore, Pisa, Italy.
  • dAlso at Università di Ferrara, Ferrara, Italy.
  • eAlso at Università di Milano Bicocca, Milano, Italy.
  • fAlso at Università di Bologna, Bologna, Italy.
  • gAlso at Università di Genova, Genova, Italy.
  • hAlso at Università di Bari, Bari, Italy.
  • iAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
  • jAlso at Università di Cagliari, Cagliari, Italy.
  • kAlso at Departamento de Física Interdisciplinar, Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain.
  • lAlso at Università di Roma Tor Vergata, Roma, Italy.
  • mAlso at Universidade Federal do Triângulo Mineiro (UFTM), Uberaba-MG, Brazil.
  • nAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
  • oAlso at Università di Siena, Siena, Italy.
  • pAlso at Università degli Studi di Milano, Milano, Italy.
  • qAlso at Central South U., Changsha, China.
  • rAlso at Università di Padova, Padova, Italy.
  • sAlso at Università di Perugia, Perugia, Italy.
  • tAlso at Excellence Cluster ORIGINS, Munich, Germany.
  • uAlso at Dipartimento MIFT, Universita degli Studi di Messina and INFN Sezione di Catania, Italy, Messina and Catania, Italy.
  • vAlso at Università di Pisa, Pisa, Italy.
  • wAlso at Università della Basilicata, Potenza, Italy.
  • xAlso at Department of Physics, Indiana University, Bloomington, Indiana, USA.
  • yAlso at Università di Urbino, Urbino, Italy.

Phys. Rev. D 108, L011103 – Published 27 July, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L011103

Abstract

Resonant structures in the dipion mass spectrum from χc1(3872)→π+π−J/ψ decays, produced via B+→K+χc1(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb−1. A sizeable contribution from the isospin conserving χc1(3872)→ωJ/ψ decay is established for the first time, (21.4±2.3±2.0)%, with a significance of more than 7.1σ. The amplitude of isospin violating decay, χc1(3872)→ρ0J/ψ, relative to isospin conserving decay, χc1(3872)→ωJ/ψ, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.

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