Measurement of the azimuthal anisotropy of $\mathrm{{\rm Y}}$(1S) and $\mathrm{{\rm Y}}$(2S) mesons in PbPb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=$ 5.02 TeV

The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distribution of $\mathrm{{\rm Y}}$(1S) and $\mathrm{{\rm Y}}$(2S) mesons arising from PbPb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=$ 5.02 TeV are studied. The $\mathrm{{\rm Y}}$ mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The data set corresponds to an integrated luminosity of 1.7 nb${}^{-1}$. The scalar product method is used to extract the $v_2$ coefficients of the azimuthal distribution. Results are reported for the rapidity range $\mathrm{\mid }y\mathrm{\mid }$ $<$ 2.4, with the transverse momentum 0 $<$ $p_{\mathrm{T}}$ $<$ 50 GeV/$c$, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/$\psi$ mesons, the measured $v_2$ values for the $\mathrm{{\rm Y}}$ mesons are found to be consistent with zero.