Inclusive quarkonium production at forward rapidity in pp collisions at sqrt(sNN)=8 TeVстатья
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Дата последнего поиска статьи во внешних источниках: 2 декабря 2016 г.
Аннотация:We report on the inclusive production cross sections of J/ψ , ψ(2S) , Υ (1S), Υ (2S) and Υ (3S), measured at forward rapidity with the ALICE detector in pp collisions at a center-of-mass energy s√=8 TeV. The analysis is based on data collected at the LHC and corresponds to an integrated luminosity of 1.23 pb−1 . Quarkonia are reconstructed in the dimuon-decay channel. The differential production cross sections are measured as a function of the transverse momentum pT and rapidity y, over the pT 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 cross sections, integrated over pT and y, and assuming unpolarized quarkonia, are σJ/ψ=8.98±0.04±0.82 \upmu b, σψ(2S)=1.23±0.08±0.22 \upmu b, σΥ(1S)=71±6±7 nb, σΥ(2S)=26±5±4 nb and σΥ(3S)=9±4±1 nb, where the first uncertainty is statistical and the second one is systematic. These values agree, within at most 1.4σ , with measurements performed by the LHCb collaboration in the same rapidity range.