Measurement of prompt and non-prompt J/psi production cross sections at mid-rapidity in pp collisions at sqrt(s) = 7 TeV

B. Abelev L. Aphecetche 1 A. Baldisseri 2 Guillaume Batigne 1 I. Belikov 3 A.A.E. Bergognon 1 H. Borel 2 M. Bregant 1 J. Castillo Castellanos 2 J.L. Charvet 2 C. Cheshkov 4 B. Cheynis 4 H. Delagrange 1 O. Driga 1 L. Ducroux 4 M. Estienne 1 M. Germain 1 J.-Y. Grossiord 5 M. Guilbaud 4 B. Hippolyte 3 S. Jangal 3 C. Kuhn 3 A. Lardeux 1 F. Lef'Evre 1 M. Lenhardt 1 L. Luquin 1 G. Martınez Garcıa 1 A. Mas 1 L. Massacrier 1, 4 A. Matyja 1 S. Pal 2 H. Pereira Da Costa 2 P. Pillot 1 A. Rakotozafindrabe 2 C. Roy 3 X. Sanchez Castro 3 Y. Schutz 1 A. Shabetai 1 D. Stocco 1 R. Tieulent 4 A. Uras 4 R. Vernet 6 R. Wan 3 H. Yang 2 Y. Zoccarato 4 N. Arbor 7 G. Conesa Balbastre 7 J. Faivre 7 C. Furget 7 R. Guernane 7 S. Kox 7 J.S. Real 7 C. Silvestre 7 Sang Un Ahn 8 Y. .W. Baek 9 A. Baldit 9 V. Barret 9 N. Bastid 9 P. Crochet 9 P. Dupieux 9 R. Ichou 9 X. Lopez 9 F. Manso 9 M. Marchisone 9 S. Porteboeuf-Houssais 9 P. Rosnet 9 B. Vulpescu 9 X. Zhang 9
Abstract : The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at {\surd}s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int = 5.6nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum pt > 1.3 GeV/c and rapidity |y| < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the Psi(2S) and Csi_c resonances, is sigma_prompt-J/psi(pt > 1.3 GeV/c, |y| < 0.9) = 7.2 +- 0.7(stat.) +- 1.0(syst.)+1.3-1.2 (syst.pol.) mb. The pt-differential cross section for prompt J/psi has also been measured. The cross section for the production of b-hadrons decaying to J/psi with transverse momentum greater than 1.3 GeV/c in the rapidity range |y| < 0.9 is sigma_{J/psi<-h_B} = 1.26 +- 0.33 (stat.) +0.23-0.28 (syst.) mb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total cross section and dsigma/dy at midrapidity.
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Journal of High Energy Physics, Institute of Physics (IOP), 2012, 2012, pp.065. <10.1007/JHEP11/(2012)065>


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B. Abelev, L. Aphecetche, A. Baldisseri, Guillaume Batigne, I. Belikov, et al.. Measurement of prompt and non-prompt J/psi production cross sections at mid-rapidity in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, Institute of Physics (IOP), 2012, 2012, pp.065. <10.1007/JHEP11/(2012)065>. <in2p3-00702009>

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