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Gallas Torreira, A. Golutvin, A. Gomes, A. Grecu, A. Jaeger, A. Keune, A. Kozlinskiy, A. Lai, A. Leflat, A. Mac Raighne, A. Martens, A. Mart\\'in S\\'anchez, A. Massafferri, A. Mazurov, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, A. Palano, A. Papanestis, A. Pazos Alvarez, A. Pellegrino, A. P\\'erez-Calero Yzquierdo, A. Petrella, A. Petrolini, A. Phan, A. Poluektov, A. Powell, A. Puig Navarro, A. Sarti, A. Satta, A. Schopper, A. Sciubba, A. Semennikov, A. Shires, A. Solomin, A. Sparkes, A. Tsaregorodtsev, A. Ukleja, A. Vollhardt, A. Vorobyev, A. Zhelezov, A. Zvyagin, B. Adeva, B. D'Almagne, B. Gui, B. Jean-Marie, B. Jost, B. Khanji, B. Liu, B. Maynard, B. Muryn, B. Muster, B. Pietrzyk, B. Pie Valls, B. Popovici, B. Rakotomiaramanana, B. Saitta, B. Schmidt, B. Sciascia, B. Shao, B. Souza De Paula, B. Spaan, B. Storaci, B. Viaud, C. Abellan Beteta, C. Adrover, C. Barschel, C. Bauer, C. Blanks, C. Bozzi, C. Coca, C. D'Ambrosio, C. Deplano, C. F\\\"arber, C. Farinelli, C. Fitzpatrick, C. Frei, C. Gaspar, C. G\\\"obel, C. Haen, Ch. Cauet, Ch. Elsasser, C. J. Parkinson, C. Langenbruch, C. Lazzeroni, C. Linn, C. Matteuzzi, C. Mclean, C. Nguyen-Mau, C. Parkes, C. Patrignani, C. Pavel-Nicorescu, C. Potterat, C. R. Jones, C. Salzmann, C. Santamarina Rios, C. Satriano, C. Thomas, D. A. Milanes, D. A. Roa Romero, D. Brett, D. Decamp, D. Derkach, D. Dossett, D. Elsby, D. Esperante Pereira, D. Galli, D. Gascon, D. Golubkov, D. Hutchcroft, D. Hynds, D. Johnson, D. Lacarrere, D. Lambert, D. L. Perego, D. Martinez Santos, D. Moran, D. Pinci, D. Popov, D. R. Ward, D. Savrina, D. S. Bailey, D. van Eijk, D. Volyanskyy, D. Voong, D. Websdale, D. Wiedner, E. Aslanides, E. Ben-Haim, E. Fanchini, E. Graug\\'es, E. Greening, E. Gushchin, E. Hicks, E. Jans, E. Lanciotti, E. Lopez Asamar, E. Maurice, E. Perez Trigo, E. Picatoste Olloqui, E. Polycarpo, E. Rodrigues, E. Santovetti, E. Smith, E. Teodorescu, E. Thomas, E. Tournefier, E. van Herwijnen, E. Zverev, F. Alessio, F. Archilli, F. Blanc, F. Constantin, F. De Lorenzi, F. Dettori, F. Domingo Bonal, F. Dordei, F. Dupertuis, F. Eisele, F. Fontanelli, F. F. Wilson, F. Jansen, F. Jing, F. J. P. Soler, F. Kruse, F. Machefert, F. Maciuc, F. Muheim, F. Rodrigues, F. Soomro, F. Stagni, F. Teubert, F. Xing, F. Zhang, G. A. Cowan, G. Alkhazov, G. Auriemma, G. Bencivenni, G. Carboni, G. Casse, G. Ciezarek, G. Conti, G. Corti, G. D. Patel, G. Fardell, G. Graziani, G. Haefeli, G. J. Rogers, G. Krocker, G. Lafferty, G. Lanfranchi, G. Liu, G. Manca, G. Mancinelli, G. Martellotti, G. McGregor, G. N. Patrick, G. Passaleva, G. Penso, G. Pessina, G. Polok, G. Raven, G. Sabatino, G. Valenti, G. Wilkinson, H. Brown, H. Degaudenzi, H. Dijkstra, H. Gordon, H. Lu, H. Ruiz, H. V. Cliff, H. Voss, I. Bediaga, I. Belyaev, I. Burducea, I. De Bonis, I. Mous, I. Nasteva, I. Raniuk, I. R. Kenyon, I. Sepp, I. Shapoval, I. Videau, I. V. Machikhiliyan, J. A. Hernando Morata, J. Albrecht, J. Anderson, J. Benton, J. Blouw, J. Bressieux, J. Buytaert, J-C. Garnier, J. Closier, J. Cogan, J. Dickens, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J. H. Lopes, J. H. Rademacker, J. Imong, J. J. Back, J. J. Saborido Silva, J. J. Velthuis, J. Keaveney, J. Lefran\\c{c}ois, J. Luisier, J. Magnin, J. Marks, J. M. de Miranda, J. Merkel, J. Molina Rodriguez, J. M. Otalora Goicochea, J. Mylroie-Smith, J. Palacios, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. van den Brand, J. van Leerdam, J. van Tilburg, J. Visniakov, J. Wang, J. Wishahi, K. Belous, K. Carvalho Akiba, K. Ciba, K. Hennessy, K. Holubyev, K. Kreplin, K. Kruzelecki, K. M\\\"uller, K. Pal, K. Rinnert, K. Senderowska, K. Sobczak, K. Wyllie, L. A. Granado Cardoso, L. Arrabito, L. Carson, L. Del Buono, L. De Paula, L. Eklund, L. Est\\'eve, L. Garrido, LHCb collaboration: R. Aaij, L. Kravchuk, L. Li, L. Li Gioi, L. Martin, L. Shekhtman, L. Wiggers, L. Zhang, L. Zhong, M. Adinolfi, M. Alexander, M. Artuso, M. Benayoun, M. Britsch, M. Calvi, M. Calvo Gomez, M. Cattaneo, M. Charles, M. Clemencic, M. Coombes, M. De Cian, M. Deckenhoff, M. Deissenroth, M. Ferro-Luzzi, M. Fontana, M. Frank, M. Frosini, M. Gandelman, M. Gersabeck, M. Grabalosa G\\'andara, M.-H. Schune, M. Jahjah Hussein, M. John, M. Kaballo, M. Karacson, M. Knecht, M. Kreps, M. Kucharczyk, M. Lieng, M. Liles, M. Matveev, M. Meissner, M. Merk, M. M. Reid, M. Musy, M. Nedos, M. Needham, M. Nicol, M.-N. Minard, M.-O. Bettler, M. Orlandea, M. Palutan, M. Pappagallo, M. Patel, M. Pepe Altarelli, M. Perrin-Terrin, M. Plo Casasus, M. P. Williams, M. Rosello, M. Sannino, M. Sapunov, M. Savrie, M. Schiller, M. Schlupp, M. Schmelling, M. Seco, M. Shapkin, M. S. Rangel, M. Straticiuc, M. Szczekowski, M. Tobin, M. T. Tran, M. Ubeda Garcia, M. van Beuzekom, M. Veltri, M. Whitehead, M. Williams, M. Witek, M. Zavertyaev, N. A. Smith, N. Bondar, N. Chiapolini, N. Gauvin, N. Harnew, N. H. Brook, N. K. Watson, N. Lopez-March, N. Mangiafave, N. Neufeld, N. Nikitin, N. Sagidova, N. Serra, N. Torr, N. Tuning, O. Aquines Gutierrez, O. Callot, O. Deschamps, O. Leroy, O. Maev, O. Okhrimenko, O. Schneider, O. Shevchenko, O. Steinkamp, O. Yushchenko, P. Alvarez Cartelle, P. Campana, P. Collins, P. David, P. De Simone, P. Diniz Batista, P. E. L. Clarke, P. F. Harrison, P. Gandini, Ph. Charpentier, P. Henrard, Ph. Ghez, P. Hopchev, P. Hunt, P. Ilten, P. Jaton, P. Koppenburg, P. Krokovny, P. M. Bj{\\o}rnstad, P. Morawski, P. Naik, P. N. Y. David, P. Owen, P. Perret, P. Robbe, P. Rodriguez Perez, P. Sail, P. Schaack, P. Seyfert, P. Shatalov, P. Spradlin, P. Szczypka, P. Urquijo, P. Vazquez Regueiro, R. B. Appleby, R. Bernet, R. Cardinale, R. Currie, R. Dzhelyadin, R. Ekelhof, R. Forty, R. Graciani Diaz, R. Harji, R. Jacobsson, R. J. Barlow, R. Lef\\'evre, R. Le Gac, R. Lindner, R. M\\\"arki, R. McNulty, R. M. D. Mamunur, R. Messi, R. Mountain, R. Muresan, R. Nandakumar, R. Oldeman, R. Plackett, R. Santacesaria, R. Santinelli, R. Schwemmer, R. S. Huston, R. Silva Coutinho, R. Vazquez Gomez, R. W. Lambert, R. Young, S. Amato, S. A. Wotton, S. Bachmann, S. Barsuk, S. Belogurov, S. Benson, S. Bifani, S. Blusk, S. Borghi, S. Cadeddu, S. C. Haines, S. De Capua, S. Donleavy, S. Easo, S. Eidelman, S. Eisenhardt, S. Farry, S. Filippov, S. Furcas, S. Gregson, S. Hansmann-Menzemer, S. Kandybei, S. K. Paterson, S. Malde, S. Miglioranzi, S. Monteil, S. Oggero, S. Ogilvy, S. Perazzini, S. Playfer, S. Redford, S. Ricciardi, S. Roiser, S. Schleich, S. Stahl, S. Stoica, S. Stone, S. Swientek, S. T'Jampens, S. Topp-Joergensen, S. Vecchi, S. Wandernoth, T. Bird, T. Blake, T. Brambach, T. Britton, T. Du Pree, T. Gershon, T. Gys, T. Hampson, Th. Bauer, T. Huse, T. J. V. Bowcock, T. Ketel, T. Kvaratskheliya, T. Latham, T. Lesiak, T. M. Karbach, T. Nakada, T. Pila\\v{r}, T. Ruf, T. Shears, T. Skwarnicki, T. Szumlak, U. Egede, U. Kerzel, U. Marconi, U. Straumann, U. Uwer, V. Balagura, V. Bocci, V. Coco, V. Egorychev, V. Fave, V. Fernandez Albor, V. Gibson, V. Heijne, V. Iakovenko, V. K. Subbiah, V. Niess, V. N. La Thi, V. Obraztsov, V. Pugatch, V. Romanovsky, V. Shevchenko, V. Tisserand, V. Vagnoni, V. V. Gligorov, W. Baldini, W. Barter, W. Bonivento, W. C. Zhang, W. Hulsbergen, W. Qian, W. Witzeling, X. Cid Vidal, X. Vilasis-Cardona, Y. Amhis, Y. Gao, Y. M. Kim, Y. Shcheglov, Yu. Guz, Y. Xie, Y. Zhang, Z. Ajaltouni, Z. Mathe, Z. Xing, Z. Yang","submitted_at":"2012-02-06T09:37:33Z","abstract_excerpt":"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 $\\sqrt{s}=7$ TeV. The $\\chi_c$ mesons are identified through their decays $\\chi_c\\to J/\\psi\\,\\gamma$ with $J/\\psi \\to \\mu^+ \\mu^-$ using 36 $\\mathrm{pb^{-1}}$ 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 of the $J/\\psi$ transverse momentum, $p_{\\mathrm{T}}^{J/\\"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1202.1080","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/3.0/","primary_cat":"hep-ex","submitted_at":"2012-02-06T09:37:33Z","cross_cats_sorted":[],"title_canon_sha256":"56f7caf53b993eaeab4ca7c0d37ff8c4f179632af56b4c27092713f1c5fdf775","abstract_canon_sha256":"2b4f896886e0952630ed0507909810a50102f399c4bc9ac8b14da0dfaa927dd1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:40:14.307780Z","signature_b64":"hdNqNo1G3Gbxby4w0I2ARrLTuxpYJ7Y8ssRe+FqWcOSHkJ6gfs/y3vmk7esv6JGIj5Y3fB0bvPQdfwZVfD11Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"56e7c41f52e3dc9fd88a512735f3e16481f728c88b5fb09a63b6f67d8c663c8a","last_reissued_at":"2026-05-18T03:40:14.307005Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:40:14.307005Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Measurement of the cross-section ratio $\\sigma(\\chi_{c2})/\\sigma(\\chi_{c1})$ for prompt $\\chi_c$ production at $\\sqrt{s}=7$ TeV","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. A. Alves Jr., A. Affolder, A. Artamonov, A. Bates, A. Bay, A. Bien, A. Bizzeti, A. Bobrov, A. Bondar, A. Borgia, A. B\\\"uchler-Germann, A. Bursche, A. Camboni, A. Carbone, A. Cardini, A. C. dos Reis, A. Comerma-Montells, A. Contu, A. Cook, A. C. Smith, A. Dosil Su\\'arez, A. Dovbnya, A. D. Webber, A. Dziurda, A. Falabella, A. Gallas Torreira, A. Golutvin, A. Gomes, A. Grecu, A. Jaeger, A. Keune, A. Kozlinskiy, A. Lai, A. Leflat, A. Mac Raighne, A. Martens, A. Mart\\'in S\\'anchez, A. Massafferri, A. Mazurov, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, A. Palano, A. Papanestis, A. Pazos Alvarez, A. Pellegrino, A. P\\'erez-Calero Yzquierdo, A. Petrella, A. Petrolini, A. Phan, A. Poluektov, A. Powell, A. Puig Navarro, A. Sarti, A. Satta, A. Schopper, A. Sciubba, A. Semennikov, A. Shires, A. Solomin, A. Sparkes, A. Tsaregorodtsev, A. Ukleja, A. Vollhardt, A. Vorobyev, A. Zhelezov, A. Zvyagin, B. Adeva, B. D'Almagne, B. Gui, B. Jean-Marie, B. Jost, B. Khanji, B. Liu, B. Maynard, B. Muryn, B. Muster, B. Pietrzyk, B. Pie Valls, B. Popovici, B. Rakotomiaramanana, B. Saitta, B. Schmidt, B. Sciascia, B. Shao, B. Souza De Paula, B. Spaan, B. Storaci, B. Viaud, C. Abellan Beteta, C. Adrover, C. Barschel, C. Bauer, C. Blanks, C. Bozzi, C. Coca, C. D'Ambrosio, C. Deplano, C. F\\\"arber, C. Farinelli, C. Fitzpatrick, C. Frei, C. Gaspar, C. G\\\"obel, C. Haen, Ch. Cauet, Ch. Elsasser, C. J. Parkinson, C. Langenbruch, C. Lazzeroni, C. Linn, C. Matteuzzi, C. Mclean, C. Nguyen-Mau, C. Parkes, C. Patrignani, C. Pavel-Nicorescu, C. Potterat, C. R. Jones, C. Salzmann, C. Santamarina Rios, C. Satriano, C. Thomas, D. A. Milanes, D. A. Roa Romero, D. Brett, D. Decamp, D. Derkach, D. Dossett, D. Elsby, D. Esperante Pereira, D. Galli, D. Gascon, D. Golubkov, D. Hutchcroft, D. Hynds, D. Johnson, D. Lacarrere, D. Lambert, D. L. Perego, D. Martinez Santos, D. Moran, D. Pinci, D. Popov, D. R. Ward, D. Savrina, D. S. Bailey, D. van Eijk, D. Volyanskyy, D. Voong, D. Websdale, D. Wiedner, E. Aslanides, E. Ben-Haim, E. Fanchini, E. Graug\\'es, E. Greening, E. Gushchin, E. Hicks, E. Jans, E. Lanciotti, E. Lopez Asamar, E. Maurice, E. Perez Trigo, E. Picatoste Olloqui, E. Polycarpo, E. Rodrigues, E. Santovetti, E. Smith, E. Teodorescu, E. Thomas, E. Tournefier, E. van Herwijnen, E. Zverev, F. Alessio, F. Archilli, F. Blanc, F. Constantin, F. De Lorenzi, F. Dettori, F. Domingo Bonal, F. Dordei, F. Dupertuis, F. Eisele, F. Fontanelli, F. F. Wilson, F. Jansen, F. Jing, F. J. P. Soler, F. Kruse, F. Machefert, F. Maciuc, F. Muheim, F. Rodrigues, F. Soomro, F. Stagni, F. Teubert, F. Xing, F. Zhang, G. A. Cowan, G. Alkhazov, G. Auriemma, G. Bencivenni, G. Carboni, G. Casse, G. Ciezarek, G. Conti, G. Corti, G. D. Patel, G. Fardell, G. Graziani, G. Haefeli, G. J. Rogers, G. Krocker, G. Lafferty, G. Lanfranchi, G. Liu, G. Manca, G. Mancinelli, G. Martellotti, G. McGregor, G. N. Patrick, G. Passaleva, G. Penso, G. Pessina, G. Polok, G. Raven, G. Sabatino, G. Valenti, G. Wilkinson, H. Brown, H. Degaudenzi, H. Dijkstra, H. Gordon, H. Lu, H. Ruiz, H. V. Cliff, H. Voss, I. Bediaga, I. Belyaev, I. Burducea, I. De Bonis, I. Mous, I. Nasteva, I. Raniuk, I. R. Kenyon, I. Sepp, I. Shapoval, I. Videau, I. V. Machikhiliyan, J. A. Hernando Morata, J. Albrecht, J. Anderson, J. Benton, J. Blouw, J. Bressieux, J. Buytaert, J-C. Garnier, J. Closier, J. Cogan, J. Dickens, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J. H. Lopes, J. H. Rademacker, J. Imong, J. J. Back, J. J. Saborido Silva, J. J. Velthuis, J. Keaveney, J. Lefran\\c{c}ois, J. Luisier, J. Magnin, J. Marks, J. M. de Miranda, J. Merkel, J. Molina Rodriguez, J. M. Otalora Goicochea, J. Mylroie-Smith, J. Palacios, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. van den Brand, J. van Leerdam, J. van Tilburg, J. Visniakov, J. Wang, J. Wishahi, K. Belous, K. Carvalho Akiba, K. Ciba, K. Hennessy, K. Holubyev, K. Kreplin, K. Kruzelecki, K. M\\\"uller, K. Pal, K. Rinnert, K. Senderowska, K. Sobczak, K. Wyllie, L. A. Granado Cardoso, L. Arrabito, L. Carson, L. Del Buono, L. De Paula, L. Eklund, L. Est\\'eve, L. Garrido, LHCb collaboration: R. Aaij, L. Kravchuk, L. Li, L. Li Gioi, L. Martin, L. Shekhtman, L. Wiggers, L. Zhang, L. Zhong, M. Adinolfi, M. Alexander, M. Artuso, M. Benayoun, M. Britsch, M. Calvi, M. Calvo Gomez, M. Cattaneo, M. Charles, M. Clemencic, M. Coombes, M. De Cian, M. Deckenhoff, M. Deissenroth, M. Ferro-Luzzi, M. Fontana, M. Frank, M. Frosini, M. Gandelman, M. Gersabeck, M. Grabalosa G\\'andara, M.-H. Schune, M. Jahjah Hussein, M. John, M. Kaballo, M. Karacson, M. Knecht, M. Kreps, M. Kucharczyk, M. Lieng, M. Liles, M. Matveev, M. Meissner, M. Merk, M. M. Reid, M. Musy, M. Nedos, M. Needham, M. Nicol, M.-N. Minard, M.-O. Bettler, M. Orlandea, M. Palutan, M. Pappagallo, M. Patel, M. Pepe Altarelli, M. Perrin-Terrin, M. Plo Casasus, M. P. Williams, M. Rosello, M. Sannino, M. Sapunov, M. Savrie, M. Schiller, M. Schlupp, M. Schmelling, M. Seco, M. Shapkin, M. S. Rangel, M. Straticiuc, M. Szczekowski, M. Tobin, M. T. Tran, M. Ubeda Garcia, M. van Beuzekom, M. Veltri, M. Whitehead, M. Williams, M. Witek, M. Zavertyaev, N. A. Smith, N. Bondar, N. Chiapolini, N. Gauvin, N. Harnew, N. H. Brook, N. K. Watson, N. Lopez-March, N. Mangiafave, N. Neufeld, N. Nikitin, N. Sagidova, N. Serra, N. Torr, N. Tuning, O. Aquines Gutierrez, O. Callot, O. Deschamps, O. Leroy, O. Maev, O. Okhrimenko, O. Schneider, O. Shevchenko, O. Steinkamp, O. Yushchenko, P. Alvarez Cartelle, P. Campana, P. Collins, P. David, P. De Simone, P. Diniz Batista, P. E. L. Clarke, P. F. Harrison, P. Gandini, Ph. Charpentier, P. Henrard, Ph. Ghez, P. Hopchev, P. Hunt, P. Ilten, P. Jaton, P. Koppenburg, P. Krokovny, P. M. Bj{\\o}rnstad, P. Morawski, P. Naik, P. N. Y. David, P. Owen, P. Perret, P. Robbe, P. Rodriguez Perez, P. Sail, P. Schaack, P. Seyfert, P. Shatalov, P. Spradlin, P. Szczypka, P. Urquijo, P. Vazquez Regueiro, R. B. Appleby, R. Bernet, R. Cardinale, R. Currie, R. Dzhelyadin, R. Ekelhof, R. Forty, R. Graciani Diaz, R. Harji, R. Jacobsson, R. J. Barlow, R. Lef\\'evre, R. Le Gac, R. Lindner, R. M\\\"arki, R. McNulty, R. M. D. Mamunur, R. Messi, R. Mountain, R. Muresan, R. Nandakumar, R. Oldeman, R. Plackett, R. Santacesaria, R. Santinelli, R. Schwemmer, R. S. Huston, R. Silva Coutinho, R. Vazquez Gomez, R. W. Lambert, R. Young, S. Amato, S. A. Wotton, S. Bachmann, S. Barsuk, S. Belogurov, S. Benson, S. Bifani, S. Blusk, S. Borghi, S. Cadeddu, S. C. Haines, S. De Capua, S. Donleavy, S. Easo, S. Eidelman, S. Eisenhardt, S. Farry, S. Filippov, S. Furcas, S. Gregson, S. Hansmann-Menzemer, S. Kandybei, S. K. Paterson, S. Malde, S. Miglioranzi, S. Monteil, S. Oggero, S. Ogilvy, S. Perazzini, S. Playfer, S. Redford, S. Ricciardi, S. Roiser, S. Schleich, S. Stahl, S. Stoica, S. Stone, S. Swientek, S. T'Jampens, S. Topp-Joergensen, S. Vecchi, S. Wandernoth, T. Bird, T. Blake, T. Brambach, T. Britton, T. Du Pree, T. Gershon, T. Gys, T. Hampson, Th. Bauer, T. Huse, T. J. V. Bowcock, T. Ketel, T. Kvaratskheliya, T. Latham, T. Lesiak, T. M. Karbach, T. Nakada, T. Pila\\v{r}, T. Ruf, T. Shears, T. Skwarnicki, T. Szumlak, U. Egede, U. Kerzel, U. Marconi, U. Straumann, U. Uwer, V. Balagura, V. Bocci, V. Coco, V. Egorychev, V. Fave, V. Fernandez Albor, V. Gibson, V. Heijne, V. Iakovenko, V. K. Subbiah, V. Niess, V. N. La Thi, V. Obraztsov, V. Pugatch, V. Romanovsky, V. Shevchenko, V. Tisserand, V. Vagnoni, V. V. Gligorov, W. Baldini, W. Barter, W. Bonivento, W. C. Zhang, W. Hulsbergen, W. Qian, W. Witzeling, X. Cid Vidal, X. Vilasis-Cardona, Y. Amhis, Y. Gao, Y. M. Kim, Y. Shcheglov, Yu. Guz, Y. Xie, Y. Zhang, Z. Ajaltouni, Z. Mathe, Z. Xing, Z. Yang","submitted_at":"2012-02-06T09:37:33Z","abstract_excerpt":"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 $\\sqrt{s}=7$ TeV. The $\\chi_c$ mesons are identified through their decays $\\chi_c\\to J/\\psi\\,\\gamma$ with $J/\\psi \\to \\mu^+ \\mu^-$ using 36 $\\mathrm{pb^{-1}}$ of data collected by the LHCb detector in 2010. 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