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The production of $\Upsilon$ mesons in Pb-Pb collisions at a centre-of-massenergy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5 TeV is measured with the muonspectrometer of the ALICE detector at the LHC. The yields as well as thenuclear modification factors are determined in the forward rapidity region$2.5<y<4.0$, as a function of rapidity, transverse momentum and collisioncentrality. The results show that the production of the $\Upsilon$(1S) meson issuppressed by a factor of about three with respect to the production inproton-proton collisions. For the first time, a significant signal for the$\Upsilon$(2S) meson is observed at forward rapidity, indicating a suppressionstronger by about a factor 2-3 with respect to the ground state. Themeasurements are compared with transport, hydrodynamic, comover and statisticalhadronisation model calculations.

$\Upsilon$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\textbf{NN}}}=5.02}$ TeV