Production of $J/\psi$ and $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons at $\sqrt{s}=8 TeV$

The production of $J/\psi$\ and $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons at $\sqrt{s}=8 Tev$ is studied with the LHCb detector using datacorresponding to an integrated luminosity of around 57 $pb^{-1}$ accumulated in the early part of 2012. Both the $J/\psi$ and $\Upsilon$ mesons are reconstructed in the $\mu^+\mu^-$ decay modes and the signal yields are extracted from a fit to the $\mu^+\mu^-$ invariant mass distributions. The analysis is performed in the rapidity range $2<y<4.5$ and transverse momentum range $0<p_t<14(15) GeV/c$ for $J/\psi(\Upsilon$). The fraction of $J/\psi$ from $b$-hadron decays is measured as a function of the $J/\psi$ transverse momentum and rapidity in the same fiducial region.