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

  title={Observation of \$J/\psi p\$ Resonances Consistent with Pentaquark States in \$\Lambda\_b^0 \to J/\psi K^- p\$ Decays},
  author={LHCb collaboration R. Aaij and Bernardo Adeva and Marco Adinolfi and A. A. Affolder and Ziad Ajaltouni and Simon Akar and Johannes Albrecht and Federico Alessio and Michael Thomas Alexander and S. Ali and Georgy Alkhazov and Paula Alvarez Cartelle and A. A. Alves and S. Amato and Silvia Amerio and Y. Amhis and Liupan An and Lucio Anderlini and J. R. Anderson and Guido Andreassi and Mirco Andreotti and Jason Emory Andrews and Robert B. Appleby and Osvaldo Aquines Guti{\'e}rrez and Flavio Archilli and Philippe d'Argent and Alexander Artamonov and Marina Artuso and Elie Aslanides and Giulio Auriemma and Marouen Baalouch and Sebastian Bachmann and John Back and Alexey Badalov and Clarissa Baesso and Wander Baldini and R. J. Barlow and Colin Barschel and Sergey Barsuk and William Barter and Varvara Batozskaya and Vincenzo Battista and Aurelio Bay and Léo Beaucourt and John Keith Beddow and F Bedeschi and I. Bediaga and Lennaert Bel and Violaine Bell{\'e}e and Nicoletta Belloli and I. Belyaev and E. Ben-Haim and Giovanni Bencivenni and Sean Benson and Jack Benton and Alexander V. Berezhnoy and Roland Bernet and Alessandro Bertolin and Marc-Olivier Bettler and Martinus van Beuzekom and Anna Bie{\~n} and Simone Bifani and P. Billoir and Thomas Bird and Alex Birnkraut and Andrea Bizzeti and Thomas Blake and Fr{\'e}d{\'e}ric Blanc and Johan Blouw and Steven Blusk and Valerio Bocci and Alexander E. Bondar and Nikolay Bondar and W M Bonivento and Silvia Borghi and M Borsato and Themis Bowcock and Espen Eie Bowen and C. Bozzi and Svende Annelies Braun and Markward Britsch and Thomas Britton and Jolanta Brodzicka and N. Brook and Albert Bursche and Jan A. N. Buytaert and Sandro Cadeddu and Roberto Calabrese and Marta Calvi and Miriam Calvo Gomez and Pierluigi Campana and D. H. Campora Perez and L. Capriotti and A. Carbone and Giovanni Carboni and Roberta Cardinale and Alessandro Cardini and Paolo Carniti and Laurence Carson and Kazuyoshi Carvalho Akiba and Gianluigi Casse and Lorenzo Cassina and L. Castillo Garc{\'i}a and Marco Cattaneo and Ch. Cauet and G Cavallero and Riccardo Cenci and Matthew John Charles and Ph. Charpentier and M. Chefdeville and S. J. Chen and Shu Faye Cheung and Nicola Chiapolini and M. Chrzaszcz and Xabier Cid Vidal and Gregory Max Ciezarek and P. E. L. Clarke and Marco Clemencic and Harry Victor Cliff and Joel Closier and Victor Coco and Julien Cogan and Eric Cogneras and Violetta Cogoni and Lucian Nicolae Cojocariu and G. Collazuol and Paula Collins and Albert Comerma-Montells and Andrea Contu and Andrew Cook and Matthew Coombes and Samuel Coquereau and Gloria Corti and Marco Corvo and Benjamin Couturier and G. Cowan and Daniel C. Craik and A. Crocombe and Melissa Maria Cruz Torres and Samuel Cunliffe and Robert Currie and Carmelo D’Ambrosio and Elena Dall’Occo and Jeremy Peter Dalseno and P. N. Y. David and Adam C. S. Davis and Kristof De Bruyn and Stefano de Capua and M. C. De Cian and Jussara M. de Miranda and Leandro de Paula and Patrizia De Simone and Cameron Thomas Dean and Daniel Decamp and Mirko Deckenhoff and L. Del Buono and N. D'el'eage and Moritz Demmer and Denis Derkach and Olivier Deschamps and Francesco Dettori and Biplab Dey and Angelo Di Canto and Francesco Ruscio and H. B. Dijkstra and S. Domingo Donleavy and Francesca Dordei and Marco Dorigo and A. Dosil Su'arez and David Dossett and Anatoliy Dovbnya and Kārlis Dreimanis and Laurent Dufour and Giulio Dujany and Fr{\'e}d{\'e}ric Dupertuis and Paolo Durante and Rustem Dzhelyadin and Agnieszka Dziurda and Alexey Dzyuba and Sajan Easo and Ulrik Egede and Victor Egorychev and Semen Eidelman and Stephan Eisenhardt and Ulrich Eitschberger and Robert Jan Ekelhof and Lars Eklund and Ibrahim El Rifai and Ch. Elsasser and Scott Ely and Sevda Esen and Hannah Mary Evans and Timothy Evans and Antonio Falabella and Ch. Farber and Nathanael Ashton Spencer Farley and Stephen Farry and Robert Fay and D. P. S. Ferguson and V{\'i}ctor Fern{\'a}ndez Albor and Frank Ferrari and Fernando Luiz Ferreira Rodrigues and Massimiliano Ferro-Luzzi and Sergey Filippov and Marco Fiore and Massimiliano Fiorini and Miroslaw Firlej and Conor Fitzpatrick and Tomasz Fiutowski and Klaus Fohl and Philip Fol and Marianna Fontana and Flavio Fontanelli and Roger W Forty and Oscar De Aguiar Francisco and M. Frank and Christopher M. Frei and Maddalena Frosini and J Fu and Emiliano Furfaro and Abraham Gallas Torreira and Domenico Galli and Stefano Gallorini and Silvia Gambetta and Miriam Gandelman and Paolo Gandini and Y. N. Gao and Juli{\'a}n Garc{\'i}a Pardi{\~n}as and Jordi Garra Tic{\'o} and Ll. Garrido and David Gascon and Clara Gaspar and R. Gauld and Laura Gavardi and Giulio Gazzoni and Angelo Geraci and David Gerick and Evelina Mihova Gersabeck and M. Gersabeck and Tim Gershon and Ph. Ghez and Alessio Gianelle and Sebastiana Gian{\`i} and Val Gibson and Olivier G{\"o}ran Girard and L. Giubega and Vladimir Vava Gligorov and Carla Gobel and Dmitry Golubkov and Andrey Golutvin and Agostinho Gomes and Claudio Gotti and M. Grabalosa G'andara and Ricardo Graciani Diaz and L. a. Granado Cardoso and E. Graug'es and Elena Graverini and Giacomo Graziani and Alexandru Tudor Grecu and Emma Greening and Sj Gregson and Peter Noel Griffith and Lucia Grillo and Oliver Grunberg and Bing Gui and Evgeny Gushchin and Yu. Guz and Thierry Gys and T. Hadavizadeh and C. Hadjivasiliou and Guido Haefeli and Christophe Haen and Susan Carol Haines and Samuel Hall and Brian Hamilton and X. Han and Stephanie Hansmann-Menzemer and Neville Harnew and Samuel Thomas Harnew and Jonathan Harrison and J. J. He and Timothy Daniel Head and Veerle Heijne and Karol Hennessy and Pierre Henrard and Louis Henry and Jose Angel Hernando Morata and Eric van Herwijnen and Miriam He{\ss} and Adl{\`e}ne Hicheur and Donal Hill and Mostafa Hoballah and P. H. Hopchev and Wouter Hulsbergen and Thibaud Humair and Nazim Hussain and David Hutchcroft and Daniel Hynds and Marek Idzik and Philip Ilten and R. Jacobsson and Andreas Jaeger and J. W. Jalocha and Eddy Jans and Abolhassan Jawahery and F. F. Jing and M. J. J. John and D. Johnson and C. Jones and Christian Joram and Beat Jost and Nathan Philip Jurik and Sergii Kandybei and Walaa Kanso and Matthias Karacson and Till Moritz Karbach and Sarah Karodia and Matthew Kelsey and Ian Richard Kenyon and M. Kenzie and Tjeerd Ketel and Basem Khanji and C Khurewathanakul and Suzanne Klaver and Konrad Klimaszewski and Olga Kochebina and Michael Kolpin and Ilya Komarov and R. F. Koopman and Patrick Koppenburg and Mohamad Kozeiha and Leonid V. Kravchuk and Katharina Kreplin and Michal Kreps and Georg Alexander Krocker and Pavel Krokovny and Florian Kruse and Wojciech Krzemień and Wojciech Kucewicz and Marcin Kucharczyk and Vasily Kudryavtsev and Axel Kevin Kuonen and Krzysztof Kurek and Tengiz Kvaratskheliya and Daniel Lacarr{\`e}re and G. D. Lafferty and Adriano Lai and D. Lambert and G Lanfranchi and Ch. Langenbruch and Benedikt Langhans and T. E. Latham and Cristina Lazzeroni and Renaud Le Gac and Jeroen van Leerdam and J. P. Lees and R{\'e}gis Lef{\`e}vre and Alexander Leflat and J. Lefranccois and O. Leroy and Tadeusz Lesiak and Blake Leverington and Y. Y. Li and Tatiana Likhomanenko and M. Liles and Rolf Lindner and Christian Linn and Federica Lionetto and B. Liu and X. Liu and David Loh and Iain Longstaff and Jos{\'e} Helder Lopes and Donatella Lucchesi and M. Lucio Martinez and H. Luo and Anna Lupato and Eleonora Luppi and Oliver Lupton and Nicola Lusardi and F. Machefert and Florin C. Maciuc and Oleg Maev and Kevin Scott Maguire and Sneha Sirirshkumar Malde and Alexander Malinin and G. Manca and Giampiero Mancinelli and Phillip L. Manning and Alessandro Mapelli and Jan Maratas and Jean François Marchand and Umberto Marini Bettolo Marconi and Carla Marin Benito and Pietro Marino and J{\"o}rg Marks and Giuseppe Martellotti and M. Martin and M. Martinelli and Diego Mart'inez Santos and Fernando Mart{\'i}nez Vidal and Danielle Martins Tostes and A. Massafferri and R. Matev and A Cridland Mathad and Zolt{\'a}n M{\'a}th{\'e} and Clara Matteuzzi and K. Matthieu and Andrea Mauri and Brice Emile Maurin and Alexander Mazurov and Michael McCann and James McCarthy and A. McNab and Ronan McNulty and Brian T. Meadows and Frank Meier and Marco Meissner and Dmytro Melnychuk and Marcel Hubert Marie Merk and Diego Milan{\'e}s and M. -N. Minard and Dominik Stefan Mitzel and J. Molina Rodriguez and Ignacio Alberto Monroy and St'ephane Monteil and Mauro Morandin and Piotr Morawski and Alessandro Mord{\`a} and Michael J. Morello and Jakub Moron and Adam Benjamin Morris and Raymond Mountain and Franz Muheim and J. Muller and Karl T. Muller and V. Muller and Manuel Mussini and Britta Muster and Paras P. Naik and T. Nakada and Rajalakshmi Nandakumar and Anita Katharine Nandi and Irina Nasteva and M. D. Needham and N. Neri and Sebastian Neubert and Niko Neufeld and Max Neuner and Anh Duc Nguyen and T. D. Nguyen and Chung Nguyen-Mau and Valentin Niess and Ramon Niet and Nikolay Nikitin and Thomas Nikodem and Daniele Ninci and Alexey A. Novoselov and Daniel O'Hanlon and Agnieszka Oblakowska-Mucha and Vladimir A. Obraztsov and Stephen Ogilvy and O. Okhrimenko and R. G. C. Oldeman and C. J. Gerco Onderwater and B. O. Rodrigues and Juan Otalora Goicochea and Adam Otto and Patrick Haworth Owen and Arantza Oyanguren and A. Palano and Fernando Palombo and Matteo Palutan and Jaap Panman and Antonios Papanestis and Marco Pappagallo and Luciano Libero Pappalardo and Cheryl Pappenheimer and Chris Parkes and Giovanni Passaleva and G. D. Patel and M. Patel and Claudia Patrignani and Alex Pearce and Antonio Pellegrino and Gianni Penso and Monica Pepe Altarelli and Stefano Perazzini and Pascal Perret and Luca Pescatore and Konstantinos Petridis and Alessandro Petrolini and Marco Petruzzo and Eduardo Picatoste Olloqui and Boleslaw Pietrzyk and T. Pilavr and Davide Pinci and Alessandro Pistone and Alessio Piucci and Stephen M. Playfer and Maximo Plo Casasus and Tuomas S. Poikela and Francesco Polci and Anton Poluektov and Ivan Polyakov and Erica Polycarpo and Alexander Popov and Dmitry Popov and Bogdan Florin Popovici and C{\'e}dric Potterat and Eugenia Price and Joseph David Price and Jessica Prisciandaro and Adrian Pritchard and Claire Prouv{\'e} and Valery M. Pugatch and Albert Puig Navarro and Giovanni Punzi and Wenbin Qian and Renato Quagliani and Bartolomiej Rachwal and Jonas Rademacker and M. Rama and Murilo Santana Rangel and Iurii Raniuk and Nathalie Rauschmayr and G. Raven and Federico Leo Redi and Stefanie Reichert and M. M. Reid and A. C. dos Reis and Stefania Ricciardi and Sophie E Richards and Mariana Rihl and Kurt Rinnert and Vicente Rives Molina and Patricia Robbe and Ana Barbara Rodrigues and Eduardo Rodrigues and J. A. Rodriguez Lopez and Pablo Rodr{\'i}guez P{\'e}rez and Stefan Roiser and V. I. Romanovsky and Arielle R. Vidal and John W. Ronayne and Marcello Rotondo and Julien Rouvinet and Thomas Ruf and P. Ruiz Valls and J. J. Saborido Silva and Naylya Sagidova and Paul D. Sail and Biagio Saitta and Valdir Salustino Guimaraes and Carlos S{\'a}nchez Mayordomo and Brais Sanmart{\'i}n Sedes and Roberta Santacesaria and Cibr{\'a}n Santamarina R{\'i}os and Marco Santimaria and Emanuele Santovetti and Alessio Sarti and Celestina Satriano and Alessia Satta and Daniel Martin Saunders and Darya Savrina and Manuel Tobias Schiller and Heinrich Schindler and Maximilian Schlupp and Michael Schmelling and Timon Schmelzer and Brian Paul Schmidt and O. Schneider and Andreas Schopper and Maxime Schubiger and M. H. Schune and Rainer Schwemmer and Barbara Sciascia and A. Sciubba and Alexander Semennikov and Nicola Serra and Justine Serrano and Lorenzo Sestini and Paul Seyfert and Mikhail Shapkin and Illya Shapoval and Yury Shcheglov and T. G. Shears and Lev I. Shekhtman and Vladimir Shevchenko and Alexander Shires and Benedetto Gianluca Siddi and R. Silva Coutinho and Gabriele Simi and Marek Sirendi and Nicola Anne Skidmore and Ian O Skillicorn and T. Skwarnicki and E. S. Smith and Iwan Thomas Smith and J. W. Smith and M. N. K. Smith and Hella Snoek and Michael D. Sokoloff and F. J. P. Soler and Fatima Soomro and De Paula B. Souza and B. Souza De Paula and Bernhard Spaan and P. Spradlin and Srikanth Sridharan and Federico Stagni and Marian Stahl and S. Stahl and Slavorima Stefkova and Olaf Steinkamp and O. V. Stenyakin and Scott Stevenson and Sabin Stoica and Sheldon Stone and B. Storaci and Simone Stracka and Mihai Straticiuc and Ulrich Straumann and L. Sun and William Lawrence Sutcliffe and Krzysztof Swientek and S. Swientek and Vasileios Syropoulos and Marek Szczekowski and P. M. Szczypka and Tomasz Szumlak and S T'jampens and Andrey Tayduganov and Tobias Tekampe and Maksym Teklishyn and Giulia Tellarini and Frederic Teubert and C. Thomas and Eric Thomas and Jeroen van Tilburg and Vincent Tisserand and Mark Tobin and Jacob Todd and Siim Tolk and Luca Tomassetti and D. Tonelli and Stig Topp-Joergensen and Nick Torr and E. Tournefier and Stephane Tourneur and Karim Trabelsi and Minh T{\^a}m Tran and Marco Tresch and Ana Trisovic and Andrei Tsaregorodtsev and Panagiotis Tsopelas and Niels Tuning and Artur Ukleja and Andrey Ustyuzhanin and Ulrich Uwer and Claudia Vacca and Vincenzo Maria Vagnoni and Giovanni Valenti and Alexis Vallier and Ricardo V{\'a}zquez G{\'o}mez and Pablo V{\'a}zquez Regueiro and Carlos V'azquez Sierra and Stefania Vecchi and J. J. Velthuis and M. Veltri and Giovanni Veneziano and M. Vesterinen and Benoit Viaud and Daniel Evangelho Vieira and Maria Vieites Diaz and Xavier Vilas{\'i}s-Cardona and Achim Vollhardt and Dmytro Volyanskyy and David Voong and An. Vorobyev and Vitaly Vorobyev and Christian Voss and Jacco Andreas De Vries and Roland Waldi and Charlotte Wallace and Ronan James Wallace and J. J. Walsh and Sebastian Wandernoth and J. C. Wang and David R. Ward and Nigel Keith Watson and David Websdale and Andreas Robert Weiden and Mark Whitehead and G. R. Wilkinson and Michael Wilkinson and M. P. Williams and M. P. Williams and Timothy Williams and F. F. Wilson and Jack Wimberley and Julian Wishahi and Wojciech Wiślicki and Mariusz Witek and Guy Wormser and Stephen Wotton and S. Wright and Kenneth Wyllie and Y. G. Xie and Z. Xu and Z. W. Yang and J. Y. Yu and X. Q. Yuan and O. P. Yushchenko and Maria Zangoli and Mikhail Zavertyaev and L. Zhang and Y. Zhang and Alexey Zhelezov and Anatoly Zhokhov and L.H. Zhong and S. Zhou J. Zucchelli},
  journal={Physical Review Letters},
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… 

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