  The production of J/psi and Upsilon mesons in pp collisions at sqrt(s) = 8
TeV is studied with the LHCb detector. The J/psi and Upsilon mesons are
reconstructed in the mu+mu- decay mode and the signal yields are determined
with a fit to the mu+mu- invariant mass distributions. The analysis is
performed in the rapidity range 2.0<y<4.5 and transverse momentum range
0<p_T<14(15) GeV/c of the J/psi(Upsilon) mesons. The J/psi and Upsilon
production cross-sections and the fraction of J/psi mesons from b-hadron decays
are measured as a function of the meson p_T and y.

High Energy Physics - Experiment