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

Karasu Uysal, Ayben; ALICE, Collaboration
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Date
2014
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https://hdl.handle.net/20.500.12498/487
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Abstract
Abstract The inclusive production cross sections at for- ward 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 corre- sponding to an integrated luminosity of 1.35 pb−1. Quarko- nia 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 pT and rapidity y, over the ranges 0 < pT < 20 GeV/c for J/ψ, 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: σJ/ψ = 6.69 ± 0.04 ± 0.63 μb, σψ(2S) = 1.13 ± 0.07 ± 0.19 μb, σΥ(1S) =54.2 ± 5.0±6.7nbandσΥ(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....  Show more  Show less
Keyword
LHC ALICE Heavy Ions Quarkonium
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