LHCb - Forward production of $\Upsilon$ mesons in $pp$ collisions at $\sqrt s$ = 7 and 8 TeV

Updated measurement of $\Upsilon$(nS) production cross-sections at $\sqrt s$ = 7 and 8 TeV is reported. The measurement is carried out for the $\Upsilon (1S)$, $\Upsilon (2S)$ and $\Upsilon (3S)$ states produced in pp collisions at the LHCb setup during the 2011 and 2012 data taking runs with integrated luminosities of about 1 and 2 fb$^{-1}$, respectively. Differential cross-sections are measured in the range $p_T$ < 30 GeV/c and $2.0 < y < 4.5$. We confirm large 30% increase in production cross-section between $\sqrt s$= 7 and 8 TeV, observed in earlier analyzes.