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Observation of New Resonances in the Λb0π+π− System

R. Aaij30, C. Abellán Beteta47, T. Ackernley57, B. Adeva44, M. Adinolfi51, H. Afsharnia8, C. A. Aidala78, S. Aiola24, Z. Ajaltouni8 et al. (LHCb Collaboration)

Z. Ajaltouni8, S. Akar62, P. Albicocco21, J. Albrecht13, F. Alessio45, M. Alexander56, A. Alfonso Albero43, G. Alkhazov36, P. Alvarez Cartelle58, A. A. Alves, Jr.44, S. Amato2, Y. Amhis10, L. An20, L. Anderlini20, G. Andreassi46, M. Andreotti19, F. Archilli15, J. Arnau Romeu9, A. Artamonov42, M. Artuso65, K. Arzymatov40, E. Aslanides9, M. Atzeni47, B. Audurier25, S. Bachmann15, J. J. Back53, S. Baker58, V. Balagura10,b, W. Baldini19,45, A. Baranov40, R. J. Barlow59, S. Barsuk10, W. Barter58, M. Bartolini22, F. Baryshnikov74, G. Bassi27, V. Batozskaya34, B. Batsukh65, A. Battig13, V. Battista46, A. Bay46, M. Becker13, F. Bedeschi27, I. Bediaga1, A. Beiter65, L. J. Bel30, V. Belavin40, S. Belin25, N. Beliy4, V. Bellee46, K. Belous42, I. Belyaev37, G. Bencivenni21, E. Ben-Haim11, S. Benson30, S. Beranek12, A. Berezhnoy38, R. Bernet47, D. Berninghoff15, E. Bertholet11, A. Bertolin26, C. Betancourt47, F. Betti18,c, M. O. Bettler52, Ia. Bezshyiko47, S. Bhasin51, J. Bhom32, M. S. Bieker13, S. Bifani50, P. Billoir11, A. Birnkraut13, A. Bizzeti20,d, M. Bjørn60, M. P. Blago45, T. Blake53, F. Blanc46, S. Blusk65, D. Bobulska56, V. Bocci29, O. Boente Garcia44, T. Boettcher61, A. Boldyrev75, A. Bondar41,e, N. Bondar36, S. Borghi59,45, M. Borisyak40, M. Borsato15, J. T. Borsuk32, M. Boubdir12, T. J. V. Bowcock57, C. Bozzi19,45, S. Braun15, A. Brea Rodriguez44, M. Brodski45, J. Brodzicka32, A. Brossa Gonzalo53, D. Brundu25,45, E. Buchanan51, A. Buonaura47, C. Burr45, A. Bursche25, J. S. Butter30, J. Buytaert45, W. Byczynski45, S. Cadeddu25, H. Cai69, R. Calabrese19,f, S. Cali21, R. Calladine50, M. Calvi23,g, M. Calvo Gomez43,h, A. Camboni43,h, P. Campana21, D. H. Campora Perez45, L. Capriotti18,c, A. Carbone18,c, G. Carboni28, R. Cardinale22, A. Cardini25, P. Carniti23,g, K. Carvalho Akiba2, A. Casais Vidal44, G. Casse57, M. Cattaneo45, G. Cavallero22, R. Cenci27,i, J. Cerasoli9, M. G. Chapman51, M. Charles11,45, Ph. Charpentier45, G. Chatzikonstantinidis50, M. Chefdeville7, V. Chekalina40, C. Chen3, S. Chen25, A. Chernov32, S.-G. Chitic45, V. Chobanova44, M. Chrzaszcz45, A. Chubykin36, P. Ciambrone21, M. F. Cicala53, X. Cid Vidal44, G. Ciezarek45, F. Cindolo18, P. E. L. Clarke55, M. Clemencic45, H. V. Cliff52, J. Closier45, J. L. Cobbledick59, V. Coco45, J. A. B. Coelho10, J. Cogan9, E. Cogneras8, L. Cojocariu35, P. Collins45, T. Colombo45, A. Comerma-Montells15, A. Contu25, N. Cooke50, G. Coombs56, S. Coquereau43, G. Corti45, C. M. Costa Sobral53, B. Couturier45, G. A. Cowan55, D. C. Craik61, A. Crocombe53, M. Cruz Torres1, R. Currie55, C. L. Da Silva64, E. Dall’Occo30, J. Dalseno44,51, C. D’Ambrosio45, A. Danilina37, P. d’Argent15, A. Davis59, O. De Aguiar Francisco45, K. De Bruyn45, S. De Capua59, M. De Cian46, J. M. De Miranda1, L. De Paula2, M. De Serio17,j, P. De Simone21, J. A. de Vries30, C. T. Dean64, W. Dean78, D. Decamp7, L. Del Buono11, B. Delaney52, H.-P. Dembinski14, M. Demmer13, A. Dendek33, V. Denysenko47, D. Derkach75, O. Deschamps8, F. Desse10, F. Dettori25, B. Dey6, A. Di Canto45, P. Di Nezza21, S. Didenko74, H. Dijkstra45, F. Dordei25, M. Dorigo27,k, A. C. dos Reis1, A. Dosil Suárez44, L. Douglas56, A. Dovbnya48, K. Dreimanis57, M. W. Dudek32, L. Dufour45, G. Dujany11, P. Durante45, J. M. Durham64, D. Dutta59, R. Dzhelyadin42,a, M. Dziewiecki15, A. Dziurda32, A. Dzyuba36, S. Easo54, U. Egede58, V. Egorychev37, S. Eidelman41,e, S. Eisenhardt55, R. Ekelhof13, S. Ek-In46, L. Eklund56, S. Ely65, A. Ene35, S. Escher12, S. Esen30, T. Evans45, A. Falabella18, J. Fan3, N. Farley50, S. Farry57, D. Fazzini10, M. Féo45, P. Fernandez Declara45, A. Fernandez Prieto44, F. Ferrari18,c, L. Ferreira Lopes46, F. Ferreira Rodrigues2, S. Ferreres Sole30, M. Ferro-Luzzi45, S. Filippov39, R. A. Fini17, M. Fiorini19,f, M. Firlej33, K. M. Fischer60, C. Fitzpatrick45, T. Fiutowski33, F. Fleuret10,b, M. Fontana45, F. Fontanelli22,l, R. Forty45, V. Franco Lima57, M. Franco Sevilla63, M. Frank45, C. Frei45, D. A. Friday56, J. 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Han6, X. Han15, T. H. Hancock60, S. Hansmann-Menzemer15, N. Harnew60, T. Harrison57, R. Hart30, C. Hasse45, M. Hatch45, J. He4, M. Hecker58, K. Heijhoff30, K. Heinicke13, A. Heister13, A. M. Hennequin45, K. Hennessy57, L. Henry77, M. Heß71, J. Heuel12, A. Hicheur66, R. Hidalgo Charman59, D. Hill60, M. Hilton59, P. H. Hopchev46, J. Hu15, W. Hu6, W. Huang4, Z. C. Huard62, W. Hulsbergen30, T. Humair58, R. J. Hunter53, M. Hushchyn75, D. Hutchcroft57, D. Hynds30, P. Ibis13, M. Idzik33, P. Ilten50, A. Inglessi36, A. Inyakin42, K. Ivshin36, R. Jacobsson45, S. Jakobsen45, J. Jalocha60, E. Jans30, B. K. Jashal77, A. Jawahery63, V. Jevtic13, F. Jiang3, M. John60, D. Johnson45, C. R. Jones52, B. Jost45, N. Jurik60, S. Kandybei48, M. Karacson45, J. M. Kariuki51, S. Karodia56, N. Kazeev75, M. Kecke15, F. Keizer52, M. Kelsey65, M. Kenzie52, T. Ketel31, B. Khanji45, A. Kharisova76, C. Khurewathanakul46, K. E. Kim65, T. Kirn12, V. S. Kirsebom46, S. Klaver21, K. Klimaszewski34, S. Koliiev49, A. Kondybayeva74, A. Konoplyannikov37, P. Kopciewicz33, R. Kopecna15, P. Koppenburg30, I. Kostiuk30,49, O. Kot49, S. Kotriakhova36, M. Kozeiha8, L. Kravchuk39, R. D. Krawczyk45, M. Kreps53, F. Kress58, S. Kretzschmar12, P. Krokovny41,e, W. Krupa33, W. Krzemien34, W. Kucewicz32,o, M. Kucharczyk32, V. Kudryavtsev41,e, H. S. Kuindersma30, G. J. Kunde64, A. K. Kuonen46, T. Kvaratskheliya37, D. Lacarrere45, G. Lafferty59, A. Lai25, D. Lancierini47, J. J. Lane59, G. Lanfranchi21, C. Langenbruch12, T. Latham53, F. Lazzari27,p, C. Lazzeroni50, R. Le Gac9, R. Lefèvre8, A. Leflat38, F. Lemaitre45, O. Leroy9, T. Lesiak32, B. Leverington15, H. Li68, P.-R. Li4,q, X. Li64, Y. Li5, Z. Li65, X. Liang65, R. Lindner45, F. Lionetto47, V. Lisovskyi10, G. Liu68, X. Liu3, D. Loh53, A. Loi25, J. Lomba Castro44, I. Longstaff56, J. H. Lopes2, G. Loustau47, G. H. Lovell52, D. Lucchesi26,r, M. Lucio Martinez30, Y. Luo3, A. Lupato26, E. Luppi19,f, O. Lupton53, A. Lusiani27, X. Lyu4, S. Maccolini18,c, F. Machefert10, F. Maciuc35, V. Macko46, P. Mackowiak13, S. Maddrell-Mander51, L. R. Madhan Mohan51, O. Maev36,45, A. Maevskiy75, K. Maguire59, D. Maisuzenko36, M. W. Majewski33, S. Malde60, B. Malecki45, A. Malinin73, T. Maltsev41,e, H. Malygina15, G. Manca25,s, G. Mancinelli9, R. Manera Escalero43, D. Manuzzi18,c, D. Marangotto24,m, J. Maratas8,t, J. F. Marchand7, U. Marconi18, S. Mariani20, C. Marin Benito10, M. Marinangeli46, P. Marino46, J. Marks15, P. J. Marshall57, G. Martellotti29, L. Martinazzoli45, M. Martinelli45,23,g, D. Martinez Santos44, F. Martinez Vidal77, A. Massafferri1, M. Materok12, R. Matev45, A. Mathad47, Z. Mathe45, V. Matiunin37, C. Matteuzzi23, K. R. Mattioli78, A. Mauri47, E. Maurice10,b, M. McCann58,45, L. Mcconnell16, A. McNab59, R. McNulty16, J. V. Mead57, B. Meadows62, C. Meaux9, N. Meinert71, D. Melnychuk34, S. Meloni23,g, M. Merk30, A. Merli24,m, E. Michielin26, D. A. Milanes70, E. Millard53, M.-N. Minard7, O. Mineev37, L. Minzoni19,f, S. E. Mitchell55, B. Mitreska59, D. S. Mitzel45, A. Mödden13, A. Mogini11, R. D. Moise58, T. Mombächer13, I. A. Monroy70, S. Monteil8, M. Morandin26, G. Morello21, M. J. Morello27,u, J. Moron33, A. B. Morris9, A. G. Morris53, R. Mountain65, H. Mu3, F. Muheim55, M. Mukherjee6, M. Mulder30, D. Müller45, J. Müller13, K. Müller47, V. Müller13, C. H. Murphy60, D. Murray59, P. Muzzetto25, P. Naik51, T. Nakada46, R. Nandakumar54, A. Nandi60, T. Nanut46, I. Nasteva2, M. Needham55, N. Neri24,m, S. Neubert15, N. Neufeld45, R. Newcombe58, T. D. Nguyen46, C. Nguyen-Mau46,v, E. M. Niel10, S. Nieswand12, N. Nikitin38, N. S. Nolte45, A. Oblakowska-Mucha33, V. Obraztsov42, S. Ogilvy56, D. P. O’Hanlon18, R. Oldeman25,s, C. J. G. Onderwater72, J. D. Osborn78, A. Ossowska32, J. M. Otalora Goicochea2, T. Ovsiannikova37, P. Owen47, A. Oyanguren77, P. R. Pais46, T. Pajero27,u, A. Palano17, M. Palutan21, G. Panshin76, A. Papanestis54, M. Pappagallo55, L. L. Pappalardo19,f, W. Parker63, C. Parkes59,45, G. Passaleva20,45, A. 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Shangase78, M. Shapkin42, T. Shears57, L. Shekhtman41,e, V. Shevchenko73,74, E. Shmanin74, J. D. Shupperd65, B. G. Siddi19, R. Silva Coutinho47, L. Silva de Oliveira2, G. Simi26,r, S. Simone17,j, I. Skiba19, N. Skidmore15, T. Skwarnicki65, M. W. Slater50, J. G. Smeaton52, E. Smith12, I. T. Smith55, M. Smith58, M. Soares18, l. Soares Lavra1, M. D. Sokoloff62, F. J. P. Soler56, B. Souza De Paula2, B. Spaan13, E. Spadaro Norella24,m, P. Spradlin56, F. Stagni45, M. Stahl62, S. Stahl45, P. Stefko46, S. Stefkova58, O. Steinkamp47, S. Stemmle15, O. Stenyakin42, M. Stepanova36, H. Stevens13, A. Stocchi10, S. Stone65, S. Stracka27, M. E. Stramaglia46, M. Straticiuc35, U. Straumann47, S. Strokov76, J. Sun3, L. Sun69, Y. Sun63, P. Svihra59, K. Swientek33, A. Szabelski34, T. Szumlak33, M. Szymanski4, S. Taneja59, Z. Tang3, T. Tekampe13, G. Tellarini19, F. Teubert45, E. Thomas45, K. A. Thomson57, M. J. Tilley58, V. Tisserand8, S. T’Jampens7, M. Tobin5, S. Tolk45, L. Tomassetti19,f, D. Tonelli27, D. Y. Tou11, E. Tournefier7, M. Traill56, M. T. Tran46, A. Trisovic52, A. Tsaregorodtsev9, G. Tuci27,45,i, A. Tully52, N. Tuning30, A. Ukleja34, A. Usachov10, A. Ustyuzhanin40,75, U. Uwer15, A. Vagner76, V. Vagnoni18, A. Valassi45, S. Valat45, G. Valenti18, M. van Beuzekom30, H. Van Hecke64, E. van Herwijnen45, C. B. Van Hulse16, J. van Tilburg30, M. van Veghel72, R. Vazquez Gomez45, P. Vazquez Regueiro44, C. Vázquez Sierra30, S. Vecchi19, J. J. Velthuis51, M. Veltri20,aa, A. Venkateswaran65, M. Vernet8, M. Veronesi30, M. Vesterinen53, J. V. Viana Barbosa45, D. Vieira4, M. Vieites Diaz46, H. Viemann71, X. Vilasis-Cardona43,h, A. Vitkovskiy30, V. Volkov38, A. Vollhardt47, D. Vom Bruch11, B. Voneki45, A. Vorobyev36, V. Vorobyev41,e, N. Voropaev36, R. Waldi71, J. Walsh27, J. Wang3, J. Wang5, M. Wang3, Y. Wang6, Z. Wang47, D. R. Ward52, H. M. Wark57, N. K. Watson50, D. Websdale58, A. Weiden47, C. Weisser61, B. D. C. Westhenry51, D. J. White59, M. Whitehead12, D. Wiedner13, G. Wilkinson60, M. Wilkinson65, I. Williams52, M. Williams61, M. R. J. Williams59, T. Williams50, F. F. Wilson54, M. Winn10, W. Wislicki34, M. Witek32, G. Wormser10, S. A. Wotton52, H. Wu65, K. Wyllie45, Z. Xiang4, D. Xiao6, Y. Xie6, H. Xing68, A. Xu3, L. Xu3, M. Xu6, Q. Xu4, Z. Xu7, Z. Xu3, Z. Yang3, Z. Yang63, Y. Yao65, L. E. Yeomans57, H. Yin6, J. Yu6,bb, X. Yuan65, O. Yushchenko42, K. A. Zarebski50, M. Zavertyaev14,w, M. Zdybal32, M. Zeng3, D. Zhang6, L. Zhang3, S. Zhang3, W. C. Zhang3,cc, Y. Zhang45, A. Zhelezov15, Y. Zheng4, X. Zhou4, Y. Zhou4, X. Zhu3, V. Zhukov12,38, J. B. Zonneveld55, and S. Zucchelli18,c (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
  • 4University of Chinese Academy of Sciences, Beijing, China
  • 5Institute Of High Energy Physics (ihep), Beijing, China
  • 6Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
  • 7Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
  • 8Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
  • 9Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
  • 10LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
  • 11LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
  • 12I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
  • 13Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
  • 14Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
  • 15Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 16School of Physics, University College Dublin, Dublin, Ireland
  • 17INFN Sezione di Bari, Bari, Italy
  • 18INFN Sezione di Bologna, Bologna, Italy
  • 19INFN Sezione di Ferrara, Ferrara, Italy
  • 20INFN Sezione di Firenze, Firenze, Italy
  • 21INFN Laboratori Nazionali di Frascati, Frascati, Italy
  • 22INFN Sezione di Genova, Genova, Italy
  • 23INFN Sezione di Milano-Bicocca, Milano, Italy
  • 24INFN Sezione di Milano, Milano, Italy
  • 25INFN Sezione di Cagliari, Monserrato, Italy
  • 26INFN Sezione di Padova, Padova, Italy
  • 27INFN Sezione di Pisa, Pisa, Italy
  • 28INFN Sezione di Roma Tor Vergata, Roma, Italy
  • 29INFN Sezione di Roma La Sapienza, Roma, Italy
  • 30Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
  • 31Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
  • 32Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
  • 33AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
  • 34National Center for Nuclear Research (NCBJ), Warsaw, Poland
  • 35Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
  • 36Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
  • 37Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia
  • 38Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
  • 39Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
  • 40Yandex School of Data Analysis, Moscow, Russia
  • 41Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
  • 42Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia
  • 43ICCUB, Universitat de Barcelona, Barcelona, Spain
  • 44Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
  • 45European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • 46Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
  • 47Physik-Institut, Universität Zürich, Zürich, Switzerland
  • 48NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
  • 49Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
  • 50University of Birmingham, Birmingham, United Kingdom
  • 51H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
  • 52Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
  • 53Department of Physics, University of Warwick, Coventry, United Kingdom
  • 54STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
  • 55School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
  • 56School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
  • 57Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
  • 58Imperial College London, London, United Kingdom
  • 59School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
  • 60Department of Physics, University of Oxford, Oxford, United Kingdom
  • 61Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
  • 62University of Cincinnati, Cincinnati, Ohio, USA
  • 63University of Maryland, College Park, Maryland, USA
  • 64Los Alamos National Laboratory (LANL), Los Alamos, USA
  • 65Syracuse University, Syracuse, New York, USA
  • 66Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil]
  • 67Pontifícia 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]
  • 68South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
  • 69School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
  • 70Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
  • 71Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
  • 72Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
  • 73National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia]
  • 74National 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]
  • 75National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia)
  • 76National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia]
  • 77Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain (associated with ICCUB, Universitat de Barcelona, Barcelona, Spain)
  • 78University of Michigan, Ann Arbor, USA (associated with Syracuse University, Syracuse, New York, USA)

  • *Full author list given at the end of the article.
  • aDeceased.
  • bAlso at Laboratoire Leprince-Ringuet, Palaiseau, France.
  • cAlso at Università di Bologna, Bologna, Italy.
  • dAlso at Università di Modena e Reggio Emilia, Modena, Italy.
  • eAlso at Novosibirsk State University, Novosibirsk, Russia.
  • fAlso at Università di Ferrara, Ferrara, Italy.
  • gAlso at Università di Milano Bicocca, Milano, Italy.
  • hAlso at LIFAELS, La Salle, Universitat Ramon Llull, Barcelona, Spain.
  • iAlso at Università di Pisa, Pisa, Italy.
  • jAlso at Università di Bari, Bari, Italy.
  • kAlso at Sezione INFN di Trieste, Trieste, Italy.
  • lAlso at Università di Genova, Genova, Italy.
  • mAlso at Università degli Studi di Milano, Milano, Italy.
  • nAlso at Universidade Federal do Triângulo Mineiro (UFTM), Uberaba-MG, Brazil.
  • oAlso at AGH—University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Kraków, Poland.
  • pAlso at Università di Siena, Siena, Italy.
  • qAlso at Lanzhou University, Lanzhou, China.
  • rAlso at Università di Padova, Padova, Italy.
  • sAlso at Università di Cagliari, Cagliari, Italy.
  • tAlso at MSU—Iligan Institute of Technology (MSU-IIT), Iligan, Philippines.
  • uAlso at Scuola Normale Superiore, Pisa, Italy.
  • vAlso at Hanoi University of Science, Hanoi, Vietnam.
  • wAlso at P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia.
  • xAlso at Università di Roma Tor Vergata, Roma, Italy.
  • yAlso at Università della Basilicata, Potenza, Italy.
  • zAlso at Università di Roma La Sapienza, Roma, Italy.
  • aaAlso at Università di Urbino, Urbino, Italy.
  • bbAlso at Physics and Micro Electronic College, Hunan University, Changsha City, China.
  • ccAlso at School of Physics and Information Technology, Shaanxi Normal University (SNNU), Xi’an, China.

Phys. Rev. Lett. 123, 152001 – Published 11 October, 2019

DOI: https://doi.org/10.1103/PhysRevLett.123.152001

Abstract

We report the observation of a new structure in the Λb0π+π− spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9  fb−1, collected at s=7, 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be mΛb(6146)0=6146.17±0.33±0.22±0.16  MeV,mΛb(6152)0=6152.51±0.26±0.22±0.16  MeV,ΓΛb(6146)0=2.9±1.3±0.3  MeV,ΓΛb(6152)0=2.1±0.8±0.3  MeV,with a mass splitting of Δm=6.34±0.32±0.02  MeV, where the first uncertainty is statistical, the second systematic. The third uncertainty for the mass measurements derives from the knowledge of the mass of the Λb0 baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of Λb(1D)0 states.

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