Observation of J/ψp Resonances Consistent with Pentaquark States in Λ$_b^0$ → J/ψK$^-$p Decays
R Aaij, G Ciezarek, J Rouvinet,P Collins,G Collazuol, S Roiser,Wenbin Qian,A Vollhardt, B Storaci,O Francisco,D P Ohanlon,M Merk,C R Jones,D Galli, Marienoelle Minard,P Krokovny,M Corvo, Ivan Polyakov,L Kravchuk, J Wishahi,D Volyanskyy,A Vallier,A Ustyuzhanin,S Bachmann,J Benton,D Gascon,T S Evans,Matthew Kelsey,Haofei Luo, N Harnew,D Hynds, M Chrzaszcz,J Panman,O Maev,G Haefeli, S Stone,J Lefrancois,H Evans,S Barsuk,F Maciuc,Danielle Martins Tostes,E Tournefier,D Pinci, M Martinez, M Baalouch,Angelo Di Canto,N Rauschmayr,G Graziani, O G Girard,C Baesso,R Waldi,N Nikitin,A Jaeger,F Jing, O Grunberg,D Vieira, Sascha Stahl, D Ninci, R F Fay,Eluned Smith,M Needham,Burkhard Schmidt, B Maurin, C Pappenheimer,A Bondar,I Smith,Monica Pepe Altarelli,S Wandernoth,O Stenyakin, C T Dean,M Szczekowski,L Eklund,Josue Molina Rodriguez,Alvaro Gomes,Francesco Di Ruscio,Matthew Kenzie,M Fiore,S Gregson,P Perez,D Derkach,A Carbone,O Deschamps,A D Nguyen,B Viaud,Martinus Van Beuzekom, M Fiorini,P Spradlin,L An,Vanessa Muller,A Pearce,R Oldeman, S Karodia,Shanzhen Chen,P Sail, Juan Jose Saborido Silva,C Hombach,Angelo Geraci,G Raven, F Lionetto,M Petruzzo,N Serra, J J Velthuis,G Tellarini,V V Gligorov,Philippe Charpentier,K Kreplin,F Stagni,A Hicheur,Marc Grabalosa Gandara, Matthieu Kecke,Eric Van Herwijnen,L Anderlini, G Punzi,R Forty,Yuehong Xie, L Sestini,L Dufour,X Vilasiscardona,D E Ward,Bo Liu,N Hussain,B Sciascia,M Idzik,Jonathan Anderson,Guy R Wilkinson, P Fol,Yuanning Gao,P Billoir,C Nguyenmau,M Karbach,Jeroen Van Leerdam,S Tolk,Janine Muller,B Hamilton,T Gys,Suvayu Ali, Antonio Augusto Alves,M Martinelli,E Grauges, Sophie Richards, Jeanpierre Lees,Bruno Osorio Rodrigues,M Borsato,E Gersabeck, F Muheim,Maria Vieites Diaz,I Shapoval,E Santovetti,M Vesterinen,U Marconi,M Liles,S Blusk,M Shapkin,Rolf Lindner,S Filippov,Stephan Eisenhardt,T Ruf,S Monteil,Mark Whitehead,M S Rangel, A Berezhnoy,B Dey, Julien Cogan,E Jans, F Bedeschi, Maximo Plo Casasus,Adam Davis,V Shevchenko,A Sarti,I Longstaff,B Gui,Jacob Todd,A Palano,Carla Marin Benito, Christian Linn,M Andreotti, A Bay, D Gerick,O Okhrimenko,C Thomas, D S Mitzel, A Weiden,S Tourneur,M Santimaria,F Meier,A B Rodrigues,J Blouw,Kazuyoshi Carvalho Akiba,V Pugatch,M Dorigo,M Veltri,Daniel Johnson,Ronan Wallace,A Pellegrino,K Petridis, B Pietrzyk,M Artuso, A Lupato,C Gaspar,A Tsaregorodtsev,C Gobel, Z Ajaltouni,S Sridharan, L Beaucourt, A Jawahery,F Dordei,A Malinin,Abraham Gallas Torreira,D C Craik,Diego Martinez Santos, M J Wilkinson,C Langenbruch,G Gazzoni, L J Bel,S Swientek, C Joram,A Satta,U Uwer, A Gianelle,David Loh,D E Hutchcroft, M Calvi,G D Lafferty,Laurence Carson,Juan Martin Otalora Goicochea,A Sciubba,M Kreps,Alexey Vorobyev,Georgy Alkhazov,B T Meadows,S Cadeddu,N H Brook,H Dijkstra,Charlotte Wallace,N Neufeld,M Palutan,M Hoballah,J H Lopes,K Wyllie,D Voong,Heinrich Schindler,F Dupertuis,Paula Alvarez Cartelle,A Affolder, T Humair, A B Morris,Zhirui Xu, A Badalov,N Sagidova,B Langhans,V Vagnoni,J Buytaert,Patrizia De Simone,Jacco De Vries,S Toppjoergensen, T Skwarnicki,S Bifani,A Papanestis,D Lucchesi,S Coquereau,B Popovici,Mitesh Patel,A Bursche,K Klimaszewski, R Calabrese, P M Manning, V Cogoni,W Kanso,Xabier Cid Vidal, T Likhomanenko,R Lefevre,D Savrina,T Head,E Greening, M Mussini,A Bertolin,E Aslanides,Alvaro Dosil Suarez,P E L Clarke, V Battista,D Golubkov,Paul Soler, L Shekhtman, Cibran Santamarina Rios,F Dettori,E Furfaro,R Schwemmer,S Benson,S Esen,T D Bird,P Griffith, G B Patel,A Grecu,S Klaver, P Perret,Osvaldo Aquines Gutierrez, S Gallorini,P Ilten,Miriam Calvo Gomez,A Oblakowskamucha, N Neri,V Romanovsky,G Passaleva,S Zucchelli,S Gambetta,Luis Alberto Granado Cardoso,Renaud Le Gac,S C Haines,Zhenwei Yang,D Tonelli,Victor Fernandez Albor, A Leflat,M Fontana, W Bonivento, F F Wilson,P Gandini,G Martellotti,Liang Zhong,E Benhaim,Yiming Li,Pieter David, A Golutvin, F Alessio,T Blake, C Khurewathanakul,T E Latham,J Mccarthy,R Niet,A 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Gomez,Pablo Vazquez Regueiro,Andrew Mcnab, C Fitzpatrick,I Raniuk, J Moron,S Cunliffe, A K Kuonen,V Egorychev,T Kvaratskheliya,R Cenci,W Wislicki,A Cardini, M Hes, A Dzyuba,J Closier, Alexander N Popov,L Tomassetti,F Kruse,S Akar,A Pritchard,F Palombo,I Bediaga,G Penso,V Heijne,V Tisserand,C Lazzeroni,W Barter, N Torr,S Farry,E Bowen, A Trisovic,Brais Sanmartin Sedes,M H Schune,S Stefkova,S Malde,I O Skillicorn,Xiaoxue Han,Y Amhis, V Batozskaya,M Meissner, T Gershon, L L Pappalardo,T Nakada,A Pistone, F Archilli, R J Barlow,F Teubert,F Machefert,I Belyaev, P Dargent,C Barschel, P Campana, L Cojocariu,S Reichert, A Petrolini,M Teklishyn,B Adeva,Liming Zhang, T Tekampe, C Bozzi,Thomas Hadavizadeh,K Fohl, M Adinolfi,A Mazurov, Eugenia Price,N Skidmore,I Nasteva,Thidung Nguyen,P Jalocha,R Mountain,C Parkes,S Vecchi,F Redi,Jackson Smith,E Polycarpo, L Cassina, A Birnkraut,E Luppi,A Lusiani,V Coco,J Dalseno,A Semennikov,M Pappagallo, M J Morello,J Marks,M Karacson, T Schmelzer, C Matteuzzi, P Henrard,Marcolivier Bettler,Albert Puig Navarro, Yury Guz,D Perez,W Hulsbergen,Maria Aranzazu Oyanguren,R Jacobsson,S Easo,M Gandelman,Karim Trabelsi,T Shears,Mark A Smith,S Ricciardi,Ulrik Egede,D Decamp, G Cowan,P Seyfert,S Braun, M Alexander,M Charles,Dean Lambert,S Ely,B Khanji,Valdir Salustino Guimaraes,Fernando Ferreira Rodrigues,A Shires, Anita Nandi,Eduardo Rodrigues,Y Shcheglov,A Poluektov, I A Monroy,B Saitta, M Chefdeville,L Buono,Lluis Garrido,Elena Dallocco,T Poikela,P Robbe,G Corti,M Frosini, Ibrahim El Rifai, J Albrecht,G Veneziano,Malcolm John,M Schiller,F Blanc, B Rachwal,O Lupton,G Manca, John William Ronayne,P Marino,S Perazzini,A Ukleja, G Dujany,C Vacca,K Rinnert, Carmelo Dambrosio,J G Tico, B Leverington,Michael Mccann,K Swientek,K Muller,N Tuning,S Giani,E Gushchin,Shufaye Cheung,T Lesiak,I Komarov,S Amato,D Melnychuk,R Cardinale, J M Walsh, D M Saunders,S T Harnew,Leandro De Paula, A D Crocombe, Rose Koopman, V Bellee,Carlos Vazquez Sierra, K Kurek,C Frei,N Jurik, N Farley,M Tobin,M Gersabeck,W Sutcliffe, C Hadjivasiliou,Markus Frank,Nikolay Bondar,W Kucewicz,D Dossett,A Otto,Jianchun Wang,J Wimberley,R Gauld,W Baldini,Semen Eidelman,M Straticiuc, A Contu, K Dreimanis,M M Reid,S Stevenson, A Piucci,V Syropoulos, G Andreassi,B Muster, G Casse,Xuesong Liu,Antonio Romero Vidal, M Schlupp,C Farber,D Popov,Stefano De Capua,Xuhao Yuan, L Capriotti, T J Williams,M Britsch,F Ferrari, J D Price, A Dziurda,M Firlej,Jibo He,R Mcnulty, C Gotti,O Steinkamp,G Lanfranchi,M Clemencic,U Eitschberger,F Fontanelli,G Carboni,S Playfer,M D Sokoloff,J Beddow, N Deleage, A Mapelli,J Maratas,R Ekelhof,S Ogilvy,Eduardo Picatoste Olloqui,T Szumlak, N Lusardi,J J Back,Jason Andrews,O Schneider, G Valenti, Vincente Rives Molina,A Schopper, N Belloli, M Cattaneo,A Dovbnya,T Pilař, J F Marchand,G Auriemma,V Niess,A Falabella,J Rademacker,M Stahl,Simon Wright,B Couturier, Jairo Alexis Rodriguez Lopez,W Krzemien,G Simi,R Bernet,F Vidal, Christophe Cauet,C Patrignani,M 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PHYSICAL REVIEW LETTERS（2015）
引用 913|浏览400
摘要
Observations of exotic structures in the J/psi p channel, which we refer to as charmonium-pentaquark states, in Lambda(0)(b) --> J/psi K(-)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/psi p 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.
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关键词
parity,structure,pentaquark,mass spectrum
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