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

@inproceedings{Aaij2012MeasurementOT,
  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. 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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},
  year={2012}
}
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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