Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays.

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Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays.

Phys Rev Lett. 2015 Aug 14;115(7):072001

Authors: Aaij R, Adeva B, Adinolfi M, Affolder A, Ajaltouni Z, Akar S, Albrecht J, Alessio F, Alexander M, Ali S, Alkhazov G, Alvarez Cartelle P, Alves AA, Amato S, Amerio S, Amhis Y, An L, Anderlini L, Anderson J, Andreassi G, Andreotti M, Andrews JE, Appleby RB, Aquines Gutierrez O, Archilli F, d’Argent P, Artamonov A, Artuso M, Aslanides E, Auriemma G, Baalouch M, Bachmann S, Back JJ, Badalov A, Baesso C, Baldini W, Barlow RJ, Barschel C, Barsuk S, Barter W, Batozskaya V, Battista V, Bay A, Beaucourt L, Beddow J, Bedeschi F, Bediaga I, Bel LJ, Bellee V, Belloli N, Belyaev I, Ben-Haim E, Bencivenni G, Benson S, Benton J, Berezhnoy A, Bernet R, Bertolin A, Bettler MO, van Beuzekom M, Bien A, Bifani S, Billoir P, Bird T, Birnkraut A, Bizzeti A, Blake T, Blanc F, Blouw J, Blusk S, Bocci V, Bondar A, Bondar N, Bonivento W, Borghi S, Borsato M, Bowcock TJ, Bowen E, Bozzi C, Braun S, Britsch M, Britton T, Brodzicka J, Brook NH, Bursche A, Buytaert J, Cadeddu S, Calabrese R, Calvi M, Calvo Gomez M, Campana P, Campora Perez D, Capriotti L, Carbone A, Carboni G, Cardinale R, Cardini A, Carniti P, Carson L, Carvalho Akiba K, Casse G, Cassina L, Castillo Garcia L, Cattaneo M, Cauet Ch, Cavallero G, Cenci R, Charles M, Charpentier P, Chefdeville M, Chen S, Cheung SF, Chiapolini N, Chrzaszcz M, Cid Vidal X, Ciezarek G, Clarke PE, Clemencic M, Cliff HV, Closier J, Coco V, Cogan J, Cogneras E, Cogoni V, Cojocariu L, Collazuol G, Collins P, Comerma-Montells A, Contu A, Cook A, Coombes M, Coquereau S, Corti G, Corvo M, Couturier B, Cowan GA, Craik DC, Crocombe A, Cruz Torres M, Cunliffe S, Currie R, D’Ambrosio C, Dall’Occo E, Dalseno J, David PN, Davis A, De Bruyn K, De Capua S, De Cian M, De Miranda JM, De Paula L, De Simone P, Dean CT, Decamp D, Deckenhoff M, Del Buono L, Déléage N, Demmer M, Derkach D, Deschamps O, Dettori F, Dey B, Di Canto A, Di Ruscio F, Dijkstra H, Donleavy S, Dordei F, Dorigo M, Dosil Suárez A, Dossett D, Dovbnya A, Dreimanis K, Dufour L, Dujany G, Dupertuis F, Durante P, Dzhelyadin R, Dziurda A, Dzyuba A, Easo S, Egede U, Egorychev V, Eidelman S, Eisenhardt S, Eitschberger U, Ekelhof R, Eklund L, El Rifai I, Elsasser Ch, Ely S, Esen S, Evans HM, Evans T, Falabella A, Färber C, Farley N, Farry S, Fay R, Ferguson D, Fernandez Albor V, Ferrari F, Ferreira Rodrigues F, Ferro-Luzzi M, Filippov S, Fiore M, Fiorini M, Firlej M, Fitzpatrick C, Fiutowski T, Fohl K, Fol P, Fontana M, Fontanelli F, Forty R, Francisco O, Frank M, Frei C, Frosini M, Fu J, Furfaro E, Gallas Torreira A, Galli D, Gallorini S, Gambetta S, Gandelman M, Gandini P, Gao Y, García Pardiñas J, Garra Tico J, Garrido L, Gascon D, Gaspar C, Gauld R, Gavardi L, Gazzoni G, Geraci A, Gerick D, Gersabeck E, Gersabeck M, Gershon T, Ghez P, Gianelle A, Gianì S, Gibson V, Girard OG, Giubega L, Gligorov VV, Göbel C, Golubkov D, Golutvin A, Gomes A, Gotti C, Grabalosa Gándara M, Graciani Diaz R, Granado Cardoso LA, Graugés E, Graverini E, Graziani G, Grecu A, Greening E, Gregson S, Griffith P, Grillo L, Grünberg O, Gui B, Gushchin E, Guz Y, Gys T, Hadavizadeh T, Hadjivasiliou C, Haefeli G, Haen C, Haines SC, Hall S, Hamilton B, Han X, Hansmann-Menzemer S, Harnew N, Harnew ST, Harrison J, He J, Head T, Heijne V, Hennessy K, Henrard P, Henry L, Hernando Morata JA, van Herwijnen E, Heß M, Hicheur A, Hill D, Hoballah M, Hombach C, Hulsbergen W, Humair T, Hussain N, Hutchcroft D, Hynds D, Idzik M, Ilten P, Jacobsson R, Jaeger A, Jalocha J, Jans E, Jawahery A, Jing F, John M, Johnson D, Jones CR, Joram C, Jost B, Jurik N, Kandybei S, Kanso W, Karacson M, Karbach TM, Karodia S, Kecke M, Kelsey M, Kenyon IR, Kenzie M, Ketel T, Khanji B, Khurewathanakul C, Klaver S, Klimaszewski K, Kochebina O, Kolpin M, Komarov I, Koopman RF, Koppenburg P, Kozeiha M, Kravchuk L, Kreplin K, Kreps M, Krocker G, Krokovny P, Kruse F, Krzemien W, Kucewicz W, Kucharczyk M, Kudryavtsev V, Kuonen AK, Kurek K, Kvaratskheliya T, Lacarrere D, Lafferty G, Lai A, Lambert D, Lanfranchi G, Langenbruch C, Langhans B, Latham T, Lazzeroni C, Le Gac R, van Leerdam J, Lees JP, Lefèvre R, Leflat A, Lefrançois J, Leroy O, Lesiak T, Leverington B, Li Y, Likhomanenko T, Liles M, Lindner R, Linn C, Lionetto F, Liu B, Liu X, Loh D, Longstaff I, Lopes JH, Lucchesi D, Lucio Martinez M, Luo H, Lupato A, Luppi E, Lupton O, Lusardi N, Lusiani A, Machefert F, Maciuc F, Maev O, Maguire K, Malde S, Malinin A, Manca G, Mancinelli G, Manning P, Mapelli A, Maratas J, Marchand JF, Marconi U, Marin Benito C, Marino P, Marks J, Martellotti G, Martin M, Martinelli M, Martinez Santos D, Martinez Vidal F, Martins Tostes D, Massafferri A, Matev R, Mathad A, Mathe Z, Matteuzzi C, Mauri A, Maurin B, Mazurov A, McCann M, McCarthy J, McNab A, McNulty R, Meadows B, Meier F, Meissner M, Melnychuk D, Merk M, Milanes DA, Minard MN, Mitzel DS, Molina Rodriguez J, Monroy IA, Monteil S, Morandin M, Morawski P, Mordà A, Morello MJ, Moron J, Morris AB, Mountain R, Muheim F, Müller J, Müller K, Müller V, Mussini M, Muster B, Naik P, Nakada T, Nandakumar R, Nandi A, Nasteva I, Needham M, Neri N, Neubert S, Neufeld N, Neuner M, Nguyen AD, Nguyen TD, Nguyen-Mau C, Niess V, Niet R, Nikitin N, Nikodem T, Ninci D, Novoselov A, O’Hanlon DP, Oblakowska-Mucha A, Obraztsov V, Ogilvy S, Okhrimenko O, Oldeman R, Onderwater CJ, Osorio Rodrigues B, Otalora Goicochea JM, Otto A, Owen P, Oyanguren A, Palano A, Palombo F, Palutan M, Panman J, Papanestis A, Pappagallo M, Pappalardo LL, Pappenheimer C, Parkes C, Passaleva G, Patel GD, Patel M, Patrignani C, Pearce A, Pellegrino A, Penso G, Pepe Altarelli M, Perazzini S, Perret P, Pescatore L, Petridis K, Petrolini A, Petruzzo M, Picatoste Olloqui E, Pietrzyk B, Pilař T, Pinci D, Pistone A, Piucci A, Playfer S, Plo Casasus M, Poikela T, Polci F, Poluektov A, Polyakov I, Polycarpo E, Popov A, Popov D, Popovici B, Potterat C, Price E, Price JD, Prisciandaro J, Pritchard A, Prouve C, Pugatch V, Puig Navarro A, Punzi G, Qian W, Quagliani R, Rachwal B, Rademacker JH, Rama M, Rangel MS, Raniuk I, Rauschmayr N, Raven G, Redi F, Reichert S, Reid MM, Dos Reis AC, Ricciardi S, Richards S, Rihl M, Rinnert K, Rives Molina V, Robbe P, Rodrigues AB, Rodrigues E, Rodriguez Lopez JA, Rodriguez Perez P, Roiser S, Romanovsky V, Romero Vidal A, Ronayne JW, Rotondo M, Rouvinet J, Ruf T, Ruiz Valls P, Saborido Silva JJ, Sagidova N, Sail P, Saitta B, Salustino Guimaraes V, Sanchez Mayordomo C, Sanmartin Sedes B, Santacesaria R, Santamarina Rios C, Santimaria M, Santovetti E, Sarti A, Satriano C, Satta A, Saunders DM, Savrina D, Schiller M, Schindler H, Schlupp M, Schmelling M, Schmelzer T, Schmidt B, Schneider O, Schopper A, Schubiger M, Schune MH, Schwemmer R, Sciascia B, Sciubba A, Semennikov A, Serra N, Serrano J, Sestini L, Seyfert P, Shapkin M, Shapoval I, Shcheglov Y, Shears T, Shekhtman L, Shevchenko V, Shires A, Siddi BG, Silva Coutinho R, Simi G, Sirendi M, Skidmore N, Skillicorn I, Skwarnicki T, Smith E, Smith E, Smith IT, Smith J, Smith M, Snoek H, Sokoloff MD, Soler FJ, Soomro F, Souza D, Souza De Paula B, Spaan B, Spradlin P, Sridharan S, Stagni F, Stahl M, Stahl S, Stefkova S, Steinkamp O, Stenyakin O, Stevenson S, Stoica S, Stone S, Storaci B, Stracka S, Straticiuc M, Straumann U, Sun L, Sutcliffe W, Swientek K, Swientek S, Syropoulos V, Szczekowski M, Szczypka P, Szumlak T, T’Jampens S, Tayduganov A, Tekampe T, Teklishyn M, Tellarini G, Teubert F, Thomas C, Thomas E, van Tilburg J, Tisserand V, Tobin M, Todd J, Tolk S, Tomassetti L, Tonelli D, Topp-Joergensen S, Torr N, Tournefier E, Tourneur S, Trabelsi K, Tran MT, Tresch M, Trisovic A, Tsaregorodtsev A, Tsopelas P, Tuning N, Ukleja A, Ustyuzhanin A, Uwer U, Vacca C, Vagnoni V, Valenti G, Vallier A, Vazquez Gomez R, Vazquez Regueiro P, Vázquez Sierra C, Vecchi S, Velthuis JJ, Veltri M, Veneziano G, Vesterinen M, Viaud B, Vieira D, Vieites Diaz M, Vilasis-Cardona X, Vollhardt A, Volyanskyy D, Voong D, Vorobyev A, Vorobyev V, Voß C, de Vries JA, Waldi R, Wallace C, Wallace R, Walsh J, Wandernoth S, Wang J, Ward DR, Watson NK, Websdale D, Weiden A, Whitehead M, Wilkinson G, Wilkinson M, Williams M, Williams MP, Williams M, Williams T, Wilson FF, Wimberley J, Wishahi J, Wislicki W, Witek M, Wormser G, Wotton SA, Wright S, Wyllie K, Xie Y, Xu Z, Yang Z, Yu J, Yuan X, Yushchenko O, Zangoli M, Zavertyaev M, Zhang L, Zhang Y, Zhelezov A, Zhokhov A, Zhong L, Zucchelli S, LHCb Collaboration

Abstract
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.

PMID: 26317714 [PubMed – in process]

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