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Measurement of quarkonium production at forward rapidity in pp collisions at sqrt{s}= 7 TeV

B. Abelev Laurent Aphecetche 1 Guillaume Batigne 1 C. Cheshkov 2 B. Cheynis 2 H. Delagrange 1 L. Ducroux 2 B. Erazmus 1 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 2 M. Guilbaud 2 B. Hippolyte 3 C. Kuhn 3 A. Lardeux 1 Gines Martinez Garcia 1 A. Mas 1 L. Massacrier 1 A. Morreale 1 Philippe Pillot 1 L. Ronflette 1 C. Roy 1 X. Sanchez Castro 3 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 2 A. Uras 2 R. Vernet 4 M. Wang 1 J. Zhu 1 Y. Zoccarato 2 N. Arbor 5 G. Conesa Balbastre 5 J. Faivre 5 C. Furget 5 R. Guernane 5 S. Kox 5 J.S. Real 5 C. Silvestre 5 Y.W. Baek 6 V. Barret 6 N. Bastid 6 P. Crochet 6 P. Dupieux 6 S. Li 6 X. Lopez 6 F. Manso 6 M. Marchisone 6 S. Porteboeuf-Houssais 6 P. Rosnet 6 L. Valencia Palomo 6 B. Vulpescu 6 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 L. Valencia Palomo 7 A. Baldisseri 8 Herve Borel 8 Javier Castillo Castellanos 8 Jean-Luc Charvet 8 Hugo Pereira da Costa 8 A Rakotozafindrabe 9, 8
Abstract : The inclusive production cross sections at forward rapidity of J/psi, psi(2S), Upsilon(1S) and Upsilon(2S) are measured in pp collisions at sqrt{s} = 7 TeV with the ALICE detector at the LHC. The analysis is based in a data sample corresponding to an integrated luminosity of 1.35 pb^-1. Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the mu+mu- invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum pt and rapidity y, over the ranges 0 < pt < 20 GeV/c for J/psi, 0 < pt < 12 GeV/c for all other resonances and for 2.5 < y < 4. The measured cross sections integrated over pt and y, and assuming unpolarized quarkonia, are: sigma_{J/psi} = 6.69 +- 0.04 +- 0.63 microbarn, sigma_{psiprime} = 1.13 +- 0.07 +- 0.14 microbarn, sigma_{Upsilon(1S)} = 54.2 +- 5.0 +- 6.7 nb and sigma_{Upsilon(2S)} = 18.4 +- 3.7 +- 2.2 nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models.
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Submitted on : Monday, March 17, 2014 - 8:55:31 AM
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B. Abelev, Laurent Aphecetche, Guillaume Batigne, C. Cheshkov, B. Cheynis, et al.. Measurement of quarkonium production at forward rapidity in pp collisions at sqrt{s}= 7 TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2014, 74, pp.2974. ⟨10.1140/epjc/s10052-014-2974-4⟩. ⟨in2p3-00959806⟩

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