Measurement of the cross-section ratio sigma(chi(c2))/sigma(chi(c1)) for prompt chi(c) production at root s=7 TeV LHCb Collaboration

  title={Measurement of the cross-section ratio sigma(chi(c2))/sigma(chi(c1)) for prompt chi(c) production at root s=7 TeV LHCb Collaboration},
  author={LHCb collaboration R. Aaij and Carlos Abell{\'a}n Beteta and Bernardo Adeva and Marianna Adinolfi and C. Adrover and A. A. Affolder and Ziad Ajaltouni and Johannes Albrecht and Federico Alessio and Magazinov Alexander and Georgy Alkhazov and P. Alvarez Cartelle and A. A. Alves and Sandra Amato and Yasmine Amhis and Jacob Anderson and R. B. Appleby and Osvaldo Aquines Guti{\'e}rrez and Flavio Archilli and Luisa Arrabito and Andrei Artamonov and Marina Artuso and Elie Aslanides and Giulio Auriemma and Sebastian Bachmann and J. J. Back and D. S. Bailey and Vladislav Balagura and Wander Baldini and R. J. Barlow and Colin Barschel and S. Barsuk and William Barter and A. Bates and Ch Bauer and Th. Bauer and Anders Bay and Ignacio Bediaga and S. A. Belogurov and Konstantin Belous and I. Belyaev and Eric Benhaim and Maurice Benayoun and Giovanni Bencivenni and Sean Benson and Jack S Benton and R. Bernet and M. -O. Bettler and Martinus van Beuzekom and Anna Bie{\~n} and Simone Bifani and Thomas Bird and Andrea Bizzeti and P. M. Bj{\o}rnstad and Thomas Blake and Fr'ed'eric Blanc and C. Blanks and Johan Blouw and Steven Blusk and A. Ye. Bobrov and Valerio Bocci and Alexander Bondar and N. Bondar and Walter Bonivento and Silvia Borghi and A. Borgia and T. J. V. Bowcock and C. Bozzi and T. Brambach and J. van den Brand and Jo{\"e}l Bressieux and David Brett and Markward Britsch and Tom Britton and N. H. Brook and Henry Brown and A. Buchler-Germann and Ion Burducea and Albert Bursche and Jan Buytaert and Sandro Cadeddu and Olivier Callot and M. Calvi and Michael Gomez and Alessandro Camboni and Pierluigi Campana and A. Carbone and Giovanni Carboni and Roberta Cardinale and Alessandro Cardini and L. Carson and Kazuyoshi Carvalho Akiba and G. Casse and Marco Cattaneo and Ch. Cauet and M. J. Charles and Ph. Charpentier and Nicola Chiapolini and Krzysztof Ciba and Xavier Vidal and Gregory Max Ciezarek and P. E. L. Clarke and Marco Clemencic and H. V. Cliff and Joel Closier and C. Coca and Victor Coco and Julien Cogan and Pieter Collins and Albert Comerma-Montells and Filote Constantin and Gabriella Conti and Andrea Contu and Adam Cook and M. Coombes and Gloria Corti and G. A. Cowan and Robert T. Currie and Bernard D'almagne and Claudia D'Ambrosio and P. N. Y. David and Ida de Bonis and Stefano De Capua and Michel De Cian and Francesco De Lorenzi and J. M. De Miranda and Leandro De Paula and P. De Simone and Daniel Decamp and Mirko Deckenhoff and Hubert Degaudenzi and M. Deissenroth and Luigi Del Buono and Caterina Deplano and Denis Derkach and Olivier Deschamps and Francesco Dettori and Je Dickens and H. G. Six Dijkstra and P. Diniz Batista and F. Domingo Bonal and S. Domingo Donleavy and Francesca Dordei and A. Dosil Su'arez and David Dossett and Anatoliy Dovbnya and Fr{\'e}d{\'e}ric Dupertuis and R. Dzhelyadin and Agnieszka Dziurda and Sajan Easo and Ulrik Egede and Victor Egorychev and Semen Eidelman and Daan van Eijk and Florian Eisele and Sara Eisenhardt and Robert Jan Ekelhof and Lars Eklund and Ch. Elsasser and D. Elsby and D. Esperante Pereira and L. Est'eve and Antonio Falabella and Erica Fanchini and C. Farber and G. Fardell and Chiara Farinelli and Stephen Farry and V. Fave and V. Fernandez Albor and Massimiliano Ferro-Luzzi and Sergey P. Filippov and Conor Fitzpatrick and M. Fontana and Flavio Fontanelli and Roger Forty and M. Frank and Christopher M. Frei and Maddalena Frosini and S. Furcas and A. Gallas Torreira and Dina Galli and Miriam Gandelman and Piero Gandini and Yan Gao and J-C. Garnier and J. Garofoli and Jordi Garra Tico and Ll. Garrido and David Gascon and C. Gaspar and Neal Gauvin and Marco Gersabeck and Timothy Gershon and Ph. Ghez and Val Gibson and V. V. Gligorov and Carla Gobel and Dmitry Golubkov and A. I. Golutvin and Alvaro Gomes and Hamish Gordon and M. Grabalosa G'andara and R. Graciani Diaz and L. A. Granado Cardoso and Eugeni Grauges and Giacomo Graziani and Alexandru Grecu and Emma Greening and Sam Gregson and B. Gui and Evgeny Gushchin and Yu. Guz and Thierry Gys and Guido Haefeli and Christophe Haen and S. C. Haines and T. Hampson and Stephanie Hansmann-Menzemer and Rahim Harji and Neville Harnew and Jenny Harrison and P. F. Harrison and Jin-chuan He and Veerle Heijne and Karol Hennessy and Pierre Henrard and J. A. Hernando Morata and E. van Herwijnen and Elizabeth Hicks and Kostya Holubyev and Plamen Hristov Hopchev and Wouter Hulsbergen and Peter Hunt and T. Huse and R. S. Huston and David Hutchcroft and Daniel Hynds and Viktor Iakovenko and P. Ilten and J. P. Imong and R. Jacobsson and Anne J{\"a}ger and Marwa Hussein and Eddy Jans and Femke Jansen and Pierre Jaton and B. Jean-Marie and Feifei Jing and Malcolm John and D. Johnson and C. R. Jones and Britta Jost and M. Kaballo and S. S. Kandybei and Matthias Karacson and T. M. Karbach and Joseph Keaveney and I. R. Kenyon and Ulrich Kerzel and Tjeerd Ketel and Anna Keune and Basem Khanji and Y. M. Kim and M. Knecht and Patrick Koppenburg and Alexandr Kozlinskiy and L. N. Kravchuk and K. Kreplin and Michal Kreps and Georg Alexander Krocker and Pavel Krokovny and Florian Kruse and Karol Kruzelecki and Marcin Kucharczyk and Tengiz Kvaratskheliya and V. N. La Thi and Daniel Lacarrere and George Lafferty and Alessandro Lai and D. Lambert and R. W. Lambert and E. Lanciotti and Gaia Lanfranchi and Ch. Langenbruch and Te Latham and Cristina Lazzeroni and Renaud Le Gac and J. van Leerdam and J. -P. Lees and R. L. R. Lefevre and Alexander Leflat and J. Lefranccois and Olivier Leroy and Tadeusz Lesiak and Li Li and L. Li Gioi and M. Lieng and Maurine Liles and Rolf Lindner and Christian Linn and Baodan Liu and Guangkun Liu and J. H. Lopes and E. Lopez Asamar and N. Lopez-march and H. Lu and Johan Luisier and A. Mac Raighne and Fr{\'e}d{\'e}ric Machefert and I. V. Machikhiliyan and Florin Maciuc and O. E. Maev and Javier Magnin and Sneha Malde and R. M. D. Mamunur and G. Manca and G. Mancinelli and Nicola Mangiafave and Umberto Marconi and R. Marki and Joerg Marks and Giuseppe Martellotti and Aur{\'e}lien Martens and L. M. Garcia Martin and A. Mart'in S'anchez and D. Martinez Santos and Andr{\'e} Massafferri and Z. Mathe and Clara Matteuzzi and M. Matveev and Emmanuel Maurice and B. Maynard and A. Mazurov and G. R. McGregor and Ronan McNulty and Christine McLean and Marco Meissner and M. Merk and Jordan Merkel and Roberto Messi and Silvia Miglioranzi and D. A. Milanes and M. -N. Minard and J. Molina Rodriguez and St{\'e}phane Monteil and Dermot Moran and Piotr Morawski and Raymond Mountain and I. Mous and Franz Muheim and Klaus Muller and Radu Muresan and Bogdan Muryn and B. Muster and Maxime Musy and James Mylroie-Smith and Pavan Naik and Tatsuya Nakada and Raja Nandakumar and Irina Nasteva and M. Nedos and M F Needham and Niko Neufeld and Chung Nguyen-Mau and M. Nicol and Valentin Niess and Nikolai Nikitin and Andrei Nomerotski and Andrey Novoselov and A. Oblakowska-Mucha and Vladimir Obraztsov and S. Oggero and S. Ogilvy and Oksana Okhrimenko and Rudolf Oldeman and Marius Orlandea and J. M. Otalora Goicochea and Patrick Owen and K. Pal and Jairo Palacios and Antimo Palano and Matteo Palutan and Jaap Panman and A. Papanestis and Marco Pappagallo and Chris Parkes and C. J. Parkinson and Giovanni Passaleva and G. D. Patel and Manesh Patel and S. K. Paterson and G. N. Patrick and Claudia Patrignani and C. Pavel-Nicorescu and A. Pazos Alvarez and Antonio Pellegrino and Gianni Penso and Monica Pepe Altarelli and Stefano Perazzini and D. L. Perego and E. Perez Trigo and A. P'erez-Calero Yzquierdo and P Cecilia Perret and Mathieu Perrin-terrin and Gianluigi Pessina and Andrea Petrella and A. Petrolini and A. Phan and Eduardo Picatoste Olloqui and B. Pie Valls and Bolek Pietrzyk and T. Pilavr and Davide Pinci and Richard Plackett and S. Playfer and Maximo Plo Casasus and G. Polok and A. Poluektov and Erica Polycarpo and D. Popov and Bogdan Popovici and C{\'e}dric Potterat and Annie K. Powell and Tristan du Pree and Jessica Prisciandaro and Valery Pugatch and A. Puig Navarro and Wenbin Qian and J. H. Rademacker and B. Rakotomiaramanana and M. S. Rangel and Iurii Raniuk and G. Raven and S. Redford and Monique Reid and A. C. dos Reis and Stefania Ricciardi and Kurt Rinnert and D. A. Roa Romero and Patrick Robbe and E. Rodrigues and F. Ferreira Rodrigues and P. Rodriguez Perez and G. J. Rogers and Stefan Roiser and Vladimir Romanovsky and Maxime Rosello and Julien Rouvinet and Thomas Ruf and H{\'e}ctor Ruiz and Giuseppe Sabatino and Jorge Silva and Naylya Sagidova and Paul D. Sail and Biagio Saitta and Ch. Salzmann and Mario Sannino and Roberta Santacesaria and Cibran Santamarina Rios and Roberto Santinelli and Emanuele Santovetti and M. Sapunov and Alessio Sarti and Celestina Satriano and Alessia Satta and Mauro Savri{\'e} and Darya Savrina and P. Schaack and Martin Schiller and Sebastian Schleich and Maximilian Schlupp and Michael Schmelling and Burkhard Schmidt and Otto Schneider and Andreas Schopper and M. -H. Schune and Rainer Schwemmer and B. Sciascia and Adalberto Sciubba and Marcos Seco and A. Semennikov and Katarzyna Senderowska and I. Sepp and Nicola Serra and Justine Serrano and Paul Seyfert and Benshun Shao and Mikhail Shapkin and Illya Shapoval and Pavel Shatalov and Yu. A. Shcheglov and Tara Shears and Lev Shekhtman and O. D. Shevchenko and Vladimir Shevchenko and Alexander Shires and R. Silva Coutinho and Tomasz Skwarnicki and Anthony C. Smith and N. A. Smith and Emma-Jane Smith and Krzysztof Grzegorz Sobczak and F. J. P. Soler and A. Solomin and Fatima Soomro and B. Souza De Paula and Bernhard Spaan and Ailsa Sparkes and Patrick Spradlin and Federico Stagni and S. Stahl and Olaf Steinkamp and Simona Stoica and Sheldon Stone and B. Storaci and Mihai Straticiuc and Ulrich Straumann and V. K. Subbiah and S. Swientek and Marek Szczekowski and P. M. Szczypka and Tomasz Szumlak and S T'jampens and E. Teodorescu and Frederic Teubert and Christopher Thomas and E. Thomas and Jeroen van Tilburg and Vincent Tisserand and Mark Tobin and Stig Topp-Joergensen and Nicholas Torr and Edwige Tournefier and M. T. Tran and Andrei Tsaregorodtsev and N. Tuning and M. Ubeda Garcia and Artur Ukleja and Phillip Urquijo and Ulrich Uwer and Vincenzo Vagnoni and Giovanni Valenti and R. Vazquez Gomez and P. Vazquez Regueiro and Stefania Vecchi and J. J. Velthuis and M. Veltri and Benoit Viaud and Ioana Videau and Xavier Vilas{\'i}s-Cardona and Jevgenij Vi{\vs}niakov and Achim Vollhardt and Dmytro Volyanskyy and David Voong and An. Vorobyev and Helge Voss and Sebastian Wandernoth and Jinli Wang and D. R. Ward and N. K. Watson and A. D. Webber and D. Websdale and Mark Whitehead and D. Wiedner and L. W. Wiggers and George Wilkinson and M. P. Williams and F. F. Wilson and Julian Wishahi and Mariusz Witek and W. Witzeling and S. A. Wotton and Kenneth Wyllie and Y. Xie and Fei Xing and Z. Xing and Z. Yang and R. D. Young and Oleg Yushchenko and Mikhail Zavertyaev and Fusuo Zhang and Ls Zhang and W. Chen X.-Y. Zhang and Yanfeng Zhang and Alexey Zhelezov and Lieping Zhong and E. G. Zverev and Andrey Zvyagin},
The prompt production of the charmonium chi(c1) and chi(c2) mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of root s = 7 TeV. The chi(c) mesons are identified through their decays chi(c) -> J/psi gamma with J/psi -> mu(+)mu(-) using 36 pb(-1) of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for the two chi(c) spin states. sigma(chi(c2))/sigma(chi(c1)), has been determined as a function… CONTINUE READING

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