Observation of double charm production involving open charm in pp collisions at $ \sqrt {s} = {7}\;{\text{TeV}} $

@article{Aaij2012ObservationOD,
  title={Observation of double charm production involving open charm in pp collisions at \$ \sqrt \{s\} = \{7\}\;\{\text\{TeV\}\} \$},
  author={R. Aaij and C. Abellan Beteta and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and P. Alvarez Cartelle and A. A. Alves and S. Amato and Y. Amhis and J. Anderson and R. B. Appleby and O. Aquines Gutierrez and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and J. J. Back and V. Balagura and W. Baldini and R. J. Barlow and C. Barschel and S. Barsuk and W. Barter and A. Bates and C. Bauer and Th. Bauer and A. Bay and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and R. Bernet and M.-O. Bettler and M. van Beuzekom and A. Bien and S. Bifani and T. Bird and A. Bizzeti and P. M. Bj{\o}rnstad and T. Blake and F. Blanc and C. Blanks and J. Blouw and S. Blusk and A. Bobrov and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and A. Borgia and T. J. V. Bowcock and C. Bozzi and T. Brambach and J. van den Brand and J. Bressieux and D. Brett and M. Britsch and T. Britton and N. H. Brook and H. Brown and K. de Bruyn and A. B{\"u}chler-Germann and I. Burducea and A. Bursche and J. Buytaert and S. Cadeddu and O. Callot and M. Calvi and M. Calvo Gomez and A. Camboni and P. Campana and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and L. Carson and K. Carvalho Akiba and G. Casse and M. Cattaneo and Ch. Cauet and M. Charles and Ph. Charpentier and N. Chiapolini and K. Ciba and X. Cid Vidal and G. Ciezarek and P. E. L. Clarke and M. Clemencic and H. V. Cliff and J. Closier and C. Coca and V. Coco and J. Cogan and P. Collins and A. Comerma-Montells and A. Contu and A. Cook and M. Coombes and G. Corti and B. Couturier and G. A. Cowan and R. Currie and C. D’Ambrosio and P. David and P. N. Y. David and I. De Bonis and S. De Capua and M. De Cian and J. M. De Miranda and L. De Paula and P. De Simone and D. Decamp and M. Deckenhoff and H. Degaudenzi and L. Del Buono and C. Deplano and D. Derkach and O. Deschamps and F. Dettori and J. Dickens and H. Dijkstra and P. Diniz Batista and F. Domingo Bonal and S. Donleavy and F. Dordei and A. Dosil Su{\'a}rez and D. Dossett and A. Dovbnya and F. Dupertuis and R. Dzhelyadin and A. Dziurda and S. Easo and U. Egede and V. Egorychev and S. Eidelman and D. van Eijk and F. Eisele and S. Eisenhardt and R. Ekelhof and L. Eklund and Ch. Elsasser and D. Elsby and D. Esperante Pereira and A. Falabella and C. F{\"a}rber and G. Fardell and C. Farinelli and S. Farry and V. Fave and V. Fernandez Albor and M. Ferro-Luzzi and S. Filippov and C. Fitzpatrick and M. Fontana and F. Fontanelli and R. Forty and O. Francisco and M. Frank and C. Frei and M. Frosini and S. Furcas and A. Gallas Torreira and D. Galli and M. Gandelman and P. Gandini and Y. Gao and J-C. Garnier and J. Garofoli and J. Garra Tico and L. Garrido and D. Gascon and C. Gaspar and R. Gauld and N. Gauvin and M. Gersabeck and T. Gershon and Ph. Ghez and V. Gibson and V. V. Gligorov and C. G{\"o}bel and D. Golubkov and A. Golutvin and A. Gomes and H. Gordon and M. Grabalosa G{\'a}ndara and R. Graciani Diaz and L. A. Granado Cardoso and E. Graug{\'e}s and G. Graziani and A. Grecu and E. Greening and S. Gregson and B. Gui and E. Gushchin and Yu. Guz and T. Gys and C. Hadjivasiliou and G. Haefeli and C. Haen and S. C. Haines and T. Hampson and S. Hansmann-Menzemer and R. Harji and N. Harnew and J. Harrison and P. F. Harrison and T. Hartmann and J. He and V. Heijne and K. Hennessy and P. Henrard and J. A. Hernando Morata and E. van Herwijnen and E. Hicks and K. Holubyev and P. Hopchev and W. Hulsbergen and P. Hunt and T. Huse and R. S. Huston and D. Hutchcroft and D. Hynds and V. Iakovenko and P. Ilten and J. Imong and R. Jacobsson and A. Jaeger and M. Jahjah Hussein and E. Jans and F. Jansen and P. Jaton and B. Jean-Marie and F. Jing and M. John and D. Johnson and C. R. Jones and B. Jost and M. Kaballo and S. Kandybei and M. Karacson and T. M. Karbach and J. Keaveney and I. R. Kenyon and U. Kerzel and T. Ketel and A. Keune and B. Khanji and Y. M. Kim and M. Knecht and R. F. Koopman and P. Koppenburg and M. Korolev and A. Kozlinskiy and L. Kravchuk and K. Kreplin and M. Kreps and G. Krocker and P. Krokovny and F. Kruse and K. Kruzelecki and M. Kucharczyk and V. Kudryavtsev and T. Kvaratskheliya and V. N. La Thi and D. Lacarrere and G. Lafferty and A. Lai and D. Lambert and R. W. Lambert and E. Lanciotti and G. Lanfranchi and C. Langenbruch and T. Latham and C. Lazzeroni and R. Le Gac and J. van Leerdam and J.-P. Lees and R. Lef{\`e}vre and A. Leflat and J. Lefrançois and O. Leroy and T. Lesiak and L. Li and L. Li Gioi and M. Lieng and M. Liles and R. Lindner and C. Linn and B. Liu and G. Liu and J. von Loeben and J. H. Lopes and E. Lopez Asamar and N. Lopez-March and H. Lu and J. Luisier and A. Mac Raighne and F. Machefert and I. V. Machikhiliyan and F. Maciuc and O. Maev and J. Magnin and S. Malde and R. M. D. Mamunur and G. Manca and G. Mancinelli and N. Mangiafave and U. Marconi and R. M{\"a}rki and J. Marks and G. Martellotti and A. Martens and L. Martin and A. Mart{\'i}n S{\'a}nchez and M. Martinelli and D. Martinez Santos and A. Massafferri and Z. Mathe and C. Matteuzzi and M. Matveev and E. Maurice and B. Maynard and A. Mazurov and G. McGregor and R. McNulty and M. Meissner and M. Merk and J. Merkel and S. Miglioranzi and D. A. Milanes and M.-N. Minard and J. Molina Rodriguez and S. Monteil and D. Moran and P. Morawski and R. Mountain and I. Mous and F. Muheim and K. M{\"u}ller and R. Muresan and B. Muryn and B. Muster and J. Mylroie-Smith and P. Naik and T. Nakada and R. Nandakumar and I. Nasteva and M. Needham and N. Neufeld and A. D. Nguyen and C. Nguyen-Mau and M. Nicol and V. Niess and N. Nikitin and A. Nomerotski and A. Novoselov and A. Oblakowska-Mucha and V. Obraztsov and S. Oggero and S. Ogilvy and O. Okhrimenko and R. Oldeman and M. Orlandea and J. M. Otalora Goicochea and P. Owen and K. Pal and J. Palacios and A. Palano and M. Palutan and J. Panman and A. Papanestis and M. Pappagallo and C. Parkes and C. J. Parkinson and G. Passaleva and G. D. Patel and M. Patel and S. K. Paterson and G. N. Patrick and C. Patrignani and C. Pavel-Nicorescu and A. Pazos Alvarez and A. Pellegrino and G. Penso and M. Pepe Altarelli and S. Perazzini and D. L. Perego and E. Perez Trigo and A. P{\'e}rez-Calero Yzquierdo and P. Perret and M. Perrin-Terrin and G. Pessina and A. Petrolini and A. Phan and E. Picatoste Olloqui and B. Pie Valls and B. Pietrzyk and T. Pilař and D. Pinci and R. Plackett and S. Playfer and M. Plo Casasus and G. Polok and A. Poluektov and E. Polycarpo and D. Popov and B. Popovici and C. Potterat and A. Powell and J. Prisciandaro and V. Pugatch and A. Puig Navarro and W. Qian and J. H. Rademacker and B. Rakotomiaramanana and M. S. Rangel and I. Raniuk and G. Raven and S. Redford and M. M. Reid and A. C. dos Reis and S. Ricciardi and A. Richards and K. Rinnert and D. A. Roa Romero and P. Robbe and E. Rodrigues and F. Rodrigues and P. Rodriguez Perez and G. J. Rogers and S. Roiser and V. Romanovsky and M. Rosello and J. Rouvinet and T. Ruf and H. Ruiz and G. Sabatino and J. J. Saborido Silva and N. Sagidova and P. Sail and B. Saitta and C. Salzmann and M. Sannino and R. Santacesaria and C. Santamarina Rios and R. Santinelli and E. Santovetti and M. Sapunov and A. Sarti and C. Satriano and A. Satta and M. Savrie and D. Savrina and P. Schaack and M. Schiller and H. Schindler and S. Schleich and M. Schlupp and M. Schmelling and B. Schmidt and O. Schneider and A. Schopper and M.-H. Schune and R. Schwemmer and B. Sciascia and A. Sciubba and M. Seco and A. Semennikov and K. Senderowska and I. Sepp and N. Serra and J. Serrano and P. Seyfert and M. Shapkin and I. Shapoval and P. Shatalov and Y. Shcheglov and T. Shears and L. Shekhtman and O. Shevchenko and V. Shevchenko and A. Shires and R. Silva Coutinho and T. Skwarnicki and N. A. Smith},
  journal={Journal of High Energy Physics},
  year={2012},
  volume={2012},
  pages={1-36}
}
A bstractThe production of J/ψ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated luminosity of 355 pb−1 collected with the LHCb detector. Model independent measurements of absolute cross-sections are given together with ratios to the measured J/ψ and open charm cross-sections. The properties of these events are studied and compared to theoretical predictions. 

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