Measurement of quarkonium production at forward rapidity in pp collisions at √ s = 7 TeV

Abelev, B. and Adam, J. and Adamová, D. and Aggarwal, M. M. and Agnello, M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmad, N. and Ahmad, Masoodi A. and Ahmed, I. and Ahn, S. U. and Ahn, S. A. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Alves, Garcia Prado C. and Andrei, C. and Andronic, A. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Lévai, Péter and Molnár, Levente and Oláh, László and Pochybova, Sona (2014) Measurement of quarkonium production at forward rapidity in pp collisions at √ s = 7 TeV. EUROPEAN PHYSICAL JOURNAL C, 74 (8). ISSN 1434-6044

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Abstract

The inclusive production cross sections at forward rapidity of J / ψ , ψ (2S ) , ϒ(1S) and ϒ(2S) are measured in pp collisions at √s = 7 TeV with the ALICE detector at the LHC. The analysis is based on 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 µ + µ − invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum p T and rapidity y, over the ranges 0 < p T < 20 GeV/ c for J / ψ, 0 < p T < 12 GeV/ c for all other resonances and for 2 . 5 < y < 4. The measured cross sections integrated over p T and y, and assuming unpolarized quarkonia, are: σJ / ψ = 6 .69 ± 0 .04 ± 0 .63 µb, σψ (2S ) = 1 .13 ± 0 .07 ± 0 .19 µb, σϒ (1S ) = 54 . 2 ± 5 . 0 ± 6 .7 nb and σϒ (2S ) = 18 . 4 ± 3 . 7 ± 2 .9 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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