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The first measurement of the $\Upsilon(1{\rm S})$ elliptic flow coefficient($v_2$) is performed at forward rapidity (2.5 $<$ $y$ $<$ 4) in Pb-Pbcollisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV with the ALICE detector at theLHC. The results are obtained with the scalar product method and are reportedas a function of transverse momentum ($p_{\rm{T}}$) up to 15 GeV/$c$ in the5-60% centrality interval. The measured $\Upsilon(1{\rm S})$ $v_2$ isconsistent with zero and with the small positive values predicted by transportmodels within uncertainties. The $v_2$ coefficient in 2 $<$ $p_{\rm T}$ $<$ 15GeV/$c$ is lower than that of inclusive J/$\psi$ mesons in the same$p_{\rm{T}}$ interval by 2.6 standard deviations. These results, combined withearlier suppression measurements, are in agreement with a scenario in which the$\Upsilon$(1S) production in Pb-Pb collisions at LHC energies is dominated bydissociation limited to the early stage of the collision whereas in theJ/$\psi$ case there is substantial experimental evidence of an additionalregeneration component.

Measurement of $\Upsilon(1{\rm S})$ elliptic flow at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}=5.02$ TeV