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Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV

V. Khachatryan D. Sillou 1 M. Besancon 2 M. Dejardin 2 D. Denegri 2 B. Fabbro 2 J.L. Faure 2 F. Ferri 2 S. Ganjour 2 F.X. Gentit 2 A. Givernaud 2 P. Gras 2 G. Hamel de Monchenault 2 P. Jarry 2 E. Locci 2 J. Malcles 2 M. Marionneau 2 L. Millischer 2 J. Rander 2 A. Rosowsky 2 M. Titov 2 P. Verrecchia 2 S. Baffioni 3 F. Beaudette 3 L. Bianchini 3 M. Bluj 3 C. Broutin 3 Pierre Busson 3 C. Charlot 3 L. Dobrzynski 3 R. Granier de Cassagnac 3 M. Haguenauer 3 P. Mine 3 C. Mironov 3 C. Ochando 3 P. Paganini 3 S. Porteboeuf 4 D. Sabes 3 R. Salerno 3 Y. Sirois 3 C. Thiebaux 3 A. Zabi 3 J.-L. Agram 5 J. Andrea 5 A. Besson 5 D. Bloch 5 D. Bodin 5 J.-M. Brom 5 M. Cardaci 5 E.C. Chabert 5 C. Collard 5 E. Conte 5 F. Drouhin 5 C. Ferro 5 J.-C. Fontaine 5 D. Gele 5 U. Goerlach 5 S. Greder 5 P. Juillot 5 M. Karim 5 A.-C. Le Bihan 5 Y. Mikami 5 P. van Hove 5 F. Fassi 6 D. Mercier 6 C. Baty 7 N. Beaupere 7 M. Bedjidian 7 O. Bondu 7 G. Boudoul 7 D. Boumediene 7 H. Brun 7 N. Chanon 7 R. Chierici 7 D. Contardo 7 P. Depasse 7 H. El Mamouni 8 A. Falkiewicz 7 J. Fay 7 S. Gascon 7 B. Ille 7 T. Kurca 7 T. Le Grand 7 M. Lethuillier 7 L. Mirabito 7 S. Perries 7 V. Sordini 7 S. Tosi 7 Y. Tschudi 7 P. Verdier 7 H. Xiao 7
Abstract : The production of J/psi mesons is studied in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC. The measurement is based on a dimuon sample corresponding to an integrated luminosity of 314 inverse nanobarns. The J/psi differential cross section is determined, as a function of the J/psi transverse momentum, in three rapidity ranges. A fit to the decay length distribution is used to separate the prompt from the non-prompt (b hadron to J/psi) component. Integrated over J/psi transverse momentum from 6.5 to 30 GeV/c and over rapidity in the range |y| < 2.4, the measured cross sections, times the dimuon decay branching fraction, are 70.9 \pm 2.1 (stat.) \pm 3.0 (syst.) \pm 7.8(luminosity) nb for prompt J/psi mesons assuming unpolarized production and 26.0 \pm 1.4 (stat.) \pm 1.6 (syst.) \pm 2.9 (luminosity) nb for J/psi mesons from b-hadron decays.
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Submitted on : Friday, November 19, 2010 - 10:48:43 AM
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V. Khachatryan, D. Sillou, M. Besancon, M. Dejardin, D. Denegri, et al.. Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1575. ⟨10.1140/epjc/s10052-011-1575-8⟩. ⟨in2p3-00537749⟩

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