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)

1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 LLR - Laboratoire Leprince-Ringuet
4 SUBATECH - Laboratoire SUBATECH Nantes
5 DRS-IPHC - Département Recherches Subatomiques
6 CC-IN2P3 - Centre de Calcul de l'IN2P3
7 IPNL - Institut de Physique Nucléaire de Lyon
8 CMS

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.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

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, 2011, 71, pp.1575. ⟨10.1140/epjc/s10052-011-1575-8⟩. ⟨in2p3-00537749⟩