# Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays

@article{Aaij2015ObservationO, title={Observation of \$J/\psi p\$ Resonances Consistent with Pentaquark States in \$\Lambda\_b^0 \to J/\psi K^- p\$ Decays}, author={L. C. R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and Federico Alessio and M. Alexander and S. Ali and G. Alkhazov and P. Cartelle and A. A. Alves and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and G. Andreassi and M. Andreotti and J. Andrews and R. Appleby and O. A. Guti{\'e}rrez and F. Archilli and P. d'Argent and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and J. Back and A. Badalov and C. Baesso and W. Baldini and R. Barlow and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and V. Battista and A. Bay and L. Beaucourt and J. Beddow and F. Bedeschi and I. Bediaga and L. Bel and V. Bellee and N. Belloli and I. Belyaev and E. Ben-Haim and G. Bencivenni and S. Benson and J. Benton and A. Berezhnoy and R. Bernet and A. Bertolin and M. Bettler and M. Beuzekom and A. Bie{\~n} and S. Bifani and P. Billoir and T. Bird and A. Birnkraut and A. Bizzeti and T. Blake and F. Blanc and J. Blouw and S. Blusk and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and M. Borsato and T. Bowcock and E. Bowen and C. Bozzi and S. Braun and M. Britsch and T. Britton and J. Brodzicka and N. Brook and A. Bursche and J. Buytaert and S. Cadeddu and R. Calabrese and M. Calvi and M. C. Gomez and P. Campana and D. Perez and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and P. Carniti and L. Carson and K. Akiba and G. Casse and L. Cassina and L. Garcia and M. Cattaneo and C. Cauet and G. Cavallero and R. Cenci and M. Charles and P. Charpentier and M. Chefdeville and S. Chen and S. Cheung and N. Chiapolini and M. Chrzaszcz and X. C. Vidal and G. Ciezarek and P. Clarke and M. Clemencic and H. Cliff and J. Closier and V. Coco and J. Cogan and E. Cogneras and V. Cogoni and L. Cojocariu and G. Collazuol and P. Collins and A. Comerma-Montells and A. Contu and A. Cook and M. Coombes and S. Coquereau and G. Corti and M. Corvo and B. Couturier and G. Cowan and D. Craik and A. Crocombe and M. C. Torres and S. Cunliffe and R. Currie and C. D’Ambrosio and E. Dall’Occo and J. Dalseno and P. David and A. Davis and K. Bruyn and S. Capua and M. Cian and J. Miranda and L. Paula and P. Simone and C. Dean and D. Decamp and M. Deckenhoff and L. Buono and N. D'el'eage and M. Demmer and D. Derkach and O. Deschamps and F. Dettori and B. Dey and A. Canto and F. Ruscio and H. Dijkstra and S. Donleavy and F. Dordei and M. Dorigo and A. Su'arez and D. Dossett and A. Dovbnya and K. Dreimanis and L. Dufour and G. Dujany and F. Dupertuis and P. Durante and R. Dzhelyadin and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and S. Eisenhardt and U. Eitschberger and R. Ekelhof and L. Eklund and I. Rifai and C. Elsasser and S. Ely and S. Esen and H. Evans and T. Evans and A. Falabella and C. Farber and N. Farley and S. Farry and R. Fay and D. Ferguson and V. F. Albor and F. Ferrari and F. Rodrigues and M. Ferro-Luzzi and S. Filippov and M. Fiore and M. Fiorini and M. Firlej and C. Fitzpatrick and T. Fiutowski and K. Fohl and P. Fol and M. Fontana and F. Fontanelli and R. Forty and O. Francisco and M. Frank and C. Frei and M. Frosini and J. Fu and E. Furfaro and A. G. Torreira and D. Galli and S. Gallorini and S. Gambetta and M. Gandelman and P. Gandini and Y. Gao and J. Pardi{\~n}as and J. G. Tic{\'o} and L. Garrido and D. Gascon and C. Gaspar and R. Gauld and L. Gavardi and G. Gazzoni and A. Geraci and D. Gerick and E. Gersabeck and M. Gersabeck and T. Gershon and P. Ghez and A. Gianelle and S. Gian{\`i} and V. Gibson and O. Girard and L. Giubega and V. Gligorov and C. Gobel and D. Golubkov and A. Golutvin and A. Gomes and C. Gotti and M. G. G'andara and R. G. Diaz and L. Cardoso and E. Graug'es and E. Graverini and G. Graziani and A. Grecu and E. Greening and S. Gregson and P. Griffith and L. Grillo and O. Grunberg and B. Gui and E. Gushchin and Y. Guz and T. Gys and T. Hadavizadeh and C. Hadjivasiliou and G. Haefeli and C. Haen and S. Haines and S. Hall and B. Hamilton and X. Han and S. Hansmann-Menzemer and N. Harnew and S. Harnew and J. Harrison and J. He and T. Head and V. Heijne and K. Hennessy and P. Henrard and L. Henry and J. A. H. Morata and E. Herwijnen and M. He{\ss} and A. Hicheur and D. Hill and M. Hoballah and P. H. Hopchev and W. Hulsbergen and T. Humair and N. Hussain and D. Hutchcroft and D. Hynds and M. Idzik and P. Ilten and R. Jacobsson and A. Jaeger and J. Jalocha and E. Jans and A. Jawahery and F. Jing and M. John and D. Johnson and C. Jones and C. Joram and B. Jost and N. Jurik and S. Kandybei and W. Kanso and M. Karacson and T. M. Karbach and S. Karodia and M. Kelsey and I. Kenyon and M. Kenzie and T. Ketel and B. Khanji and C. Khurewathanakul and S. Klaver and K. Klimaszewski and O. Kochebina and M. Kolpin and I. Komarov and R. Koopman and P. Koppenburg and M. Kozeiha and L. Kravchuk and K. Kreplin and M. Kreps and G. Krocker and P. Krokovny and F. Kruse and W. Krzemien and W. Kucewicz and M. Kucharczyk and V. Kudryavtsev and A. Kuonen and K. Kurek and T. Kvaratskheliya and D. Lacarr{\`e}re and G. Lafferty and A. Lai and D. Lambert and G. Lanfranchi and C. Langenbruch and B. Langhans and T. Latham and C. Lazzeroni and R. Gac and J. Leerdam and J. Lees and R. Lef{\`e}vre and A. Leflat and J. Lefranccois and O. Leroy and T. Lesiak and B. Leverington and Y. Li and T. Likhomanenko and M. Liles and R. Lindner and C. Linn and F. Lionetto and B. Liu and X. Liu and D. Loh and I. Longstaff and J. Lopes and D. Lucchesi and M. L. Martinez and H. Luo and A. Lupato and E. Luppi and O. Lupton and N. Lusardi and F. Machefert and F. Maciuc and O. Maev and K. Maguire and S. Malde and A. Malinin and G. Manca and G. Mancinelli and P. Manning and A. Mapelli and J. Maratas and J. Marchand and U. Marconi and C. Benito and P. Marino and J. Marks and G. Martellotti and M. Martin and M. Martinelli and D. M. Santos and F. M. Vidal and D. M. Tostes and A. Massafferri and R. Matev and A. Mathad and Z. M{\'a}th{\'e} and C. Matteuzzi and K. Matthieu and A. Mauri and B. Maurin and A. Mazurov and M. McCann and J. McCarthy and A. McNab and R. McNulty and B. Meadows and F. Meier and M. Meissner and D. Melnychuk and M. Merk and D. Milanes and M. Minard and D. Mitzel and J. M. Rodriguez and I. A. Monroy and S. Monteil and M. Morandin and P. Morawski and A. Mord{\`a} and M. Morello and J. Moron and A. Morris and R. Mountain and F. Muheim and J. Muller and K. Műller and V. Muller and M. Mussini and B. Muster and P. Naik and T. Nakada and R. Nandakumar and A. Nandi and I. Nasteva and M. Needham and N. Neri and S. Neubert and N. Neufeld and M. Neuner and A. Nguyen and T. Nguyen and C. Nguyen-Mau and V. Niess and R. Niet and N. Nikitin and T. Nikodem and D. Ninci and A. Novoselov and D. O'Hanlon and A. Oblakowska-Mucha and V. Obraztsov and S. Ogilvy and O. Okhrimenko and R. Oldeman and C. Onderwater and B. O. Rodrigues and J. Goicochea and A. Otto and P. Owen and A. Oyanguren and A. Palano and F. Palombo and M. Palutan and J. Panman and A. Papanestis and M. Pappagallo and L. Pappalardo and C. Pappenheimer and C. Parkes and G. Passaleva and G. Patel and M. Patel and C. Patrignani and A. Pearce and A. Pellegrino and G. Penso and M. Altarelli and S. Perazzini and P. Perret and L. Pescatore and K. Petridis and A. Petrolini and M. Petruzzo and E. Olloqui and B. Pietrzyk and T. Pilavr and D. Pinci and A. Pistone and A. Piucci and S. Playfer and M. P. Casasus and T. Poikela and F. Polci and A. Poluektov and I. Polyakov and E. Polycarpo and A. Popov and D. Popov and B. Popovici and C. Potterat and E. Price and J. Price and J. Prisciandaro and A. Pritchard and C. Prouve and V. Pugatch and A. Navarro and G. Punzi and W. Qian and R. Quagliani and B. Rachwal and J. Rademacker and M. Rama and M. Rangel and I. Raniuk and N. Rauschmayr and G. Raven and F. Redi and S. Reichert and M. Reid and A. Reis and S. Ricciardi and S. Richards and M. Rihl and K. Rinnert and V. Molina and P. Robbe and A. B. Rodrigues and E. Rodrigues and J. A. R. Lopez and P. P{\'e}rez and S. Roiser and V. Romanovsky and A. Vidal and J. Ronayne and M. Rotondo and J. Rouvinet and T. Ruf and P. Valls and J. J. S. Silva and N. Sagidova and P. Sail and B. Saitta and V. Guimaraes and C. S. Mayordomo and B. S. Sedes and R. Santacesaria and C. S. R{\'i}os and M. Santimaria and E. Santovetti and A. Sarti and C. Satriano and A. Satta and D. Saunders and D. Savrina and M. Schiller and H. Schindler and M. Schlupp and M. Schmelling and T. Schmelzer and B. Schmidt and O. Schneider and A. Schopper and M. Schubiger and M. Schune and R. Schwemmer and B. Sciascia and A. Sciubba and A. Semennikov and N. Serra and J. Serrano and L. Sestini and P. Seyfert and M. Shapkin and I. Shapoval and Y. Shcheglov and T. Shears and L. Shekhtman and V. Shevchenko and A. Shires and B. Siddi and R. Coutinho and G. Simi and M. Sirendi and N. Skidmore and I. Skillicorn and T. Skwarnicki and E. Smith and I. Smith and J. Smith and M. Smith and H. Snoek and M. Sokoloff and F. Soler and F. Soomro and D. Souza and B. D. Paula and B. Spaan and P. Spradlin and S. Sridharan and F. Stagni and M. Stahl and S. Stahl and S. Stefkova and O. Steinkamp and O. Stenyakin and S. Stevenson and S. Stoica and S. Stone and B. Storaci and S. Stracka and M. Straticiuc and U. Straumann and L. Sun and W. Sutcliffe and K. Swientek and S. Swientek and V. Syropoulos and M. Szczekowski and P. Szczypka and T. Szumlak and S. T'jampens and A. Tayduganov and T. Tekampe and M. Teklishyn and G. Tellarini and F. Teubert and C. Thomas and E. Thomas and J. Tilburg and V. Tisserand and M. Tobin and J. Todd and S. Tolk and L. Tomassetti and D. Tonelli and S. Topp-Joergensen and N. Torr and E. Tournefier and S. Tourneur and K. Trabelsi and M. Tran and M. Tresch and A. Trisovic and A. Tsaregorodtsev and P. Tsopelas and N. Tuning and A. Ukleja and Andrey Ustyuzhanin and U. Uwer and C. Vacca and V. Vagnoni and G. Valenti and A. Vallier and R. V. Gomez and P. Regueiro and C. V. Sierra and S. Vecchi and J. Velthuis and M. Veltri and G. Veneziano and M. Vesterinen and B. Viaud and D. Vieira and M. V. Diaz and X. Vilas{\'i}s-Cardona and A. Vollhardt and D. Volyanskyy and D. Voong and A. Vorobyev and V. Vorobyev and C. Voss and J. D. Vries and R. Waldi and C. Wallace and R. Wallace and J. Walsh and S. Wandernoth and J. Wang and D. Ward and N. Watson and D. Websdale and A. Weiden and M. Whitehead and G. Wilkinson and M. Wilkinson and M. Williams and T. Williams and F. Wilson and J. Wimberley and J. Wishahi and W. Wislicki and M. Witek and G. Wormser and S. Wotton and S. Wright and K. Wyllie and Y. Xie and Z. Xu and Z. Yang and J. Yu and X. Yuan and O. Yushchenko and M. Zangoli and M. Zavertyaev and L. Zhang and Y. Zhang and A. Zhelezov and A. Zhokhov and L. Zhong and S. Zucchelli}, journal={Physical Review Letters}, year={2015}, volume={115}, pages={072001-072001} }

Observations of exotic structures in the J/ψp channel, that we refer to as pentaquark-charmonium states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of 3/fb acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis is performed on the three-body final-state that 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… Expand

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

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