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J/psi Production as a Function of Charged Particle Multiplicity in pp Collisions at sqrt{s} = 7 TeV

B. Abelev N. Arbor 1 G. Conesa Balbastre 1 J. Faivre 1 C. Furget 1 R. Guernane 1 S. Kox 1 Y. Mao 1 J.S. Real 1 R. Vernet 2 I. Belikov 3 B. Hippolyte 3 S. Jangal 3 C. Kuhn 3 A. Maire 3 C. Roy 3 X. Sanchez Castro 3 S. Senyukov 3 R. Wan 3 Laurent Aphecetche 4 Guillaume Batigne 4 M. Bregant 4 H. Delagrange 4 O. Driga 4 Magali Estienne 4 Marie Germain 4 A. Lardeux 4 F. Lefèvre 4 M. Lenhardt 4 L. Luquin 4 Gines Martinez Garcia 4 A. Mas 4 L. Massacrier 4, 5 A. Matyja 4 Philippe Pillot 4 Y. Schutz 4 Alexandre Shabetai 4 Diego Stocco 4 C. Cheshkov 6 B. Cheynis 5 L. Ducroux 5 M. Guilbaud 5 J.-Y. Grossiord 6 R. Tieulent 5 A. Uras 5 Y. Zoccarato 5 A. Baldisseri 7 H. Borel 7 J. Castillo Castellanos 7 J.L. Charvet 7 C. Geuna 7 S. Pal 7 A. Rakoizafindrabe 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 collaboration reports the measurement of the inclusive J/psi yield as a function of charged particle pseudorapidity density dN_{ch}/deta in pp collisions at sqrt{s} = 7 TeV at the LHC. J/psi particles are detected for p_t > 0, in the rapidity interval |y| < 0.9 via decay into e+e-, and in the interval 2.5 < y < 4.0 via decay into mu+mu- pairs. An approximately linear increase of the J/psi yields normalized to their event average (dN_{J/psi}/dy)/ with (dN_{ch}/deta)/ is observed in both rapidity ranges, where dN_{ch}/deta is measured within |eta| < 1 and p_t > 0. In the highest multiplicity interval with = 24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/psi yield by a factor of about 5 at 2.5 < y < 4 (8 at |y| < 0.9) is observed.
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Submitted on : Tuesday, February 14, 2012 - 8:33:28 AM
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B. Abelev, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. J/psi Production as a Function of Charged Particle Multiplicity in pp Collisions at sqrt{s} = 7 TeV. Physics Letters B, Elsevier, 2012, 712, pp.165-175. ⟨10.1016/j.physletb.2012.04.052⟩. ⟨in2p3-00669824⟩

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