Azimuthal anisotropy of $\Upsilon\textrm{(1S)}$ mesons in pPb collisions at $\sqrt{\mathrm{s_{NN}}} = 8.16 ~\mathrm{TeV}$

The azimuthal anisotropy of $\Upsilon\textrm{(1S)}$ mesons in high-multiplicity proton-lead (pPb) collisions is studied using data collected by the CMS experiment at a center-of-mass energy per nucleon pair of $\sqrt{\mathrm{s_{NN}}} = 8.16 ~\mathrm{TeV}$. The $\Upsilon\textrm{(1S)}$ mesons are reconstructed from the dimuon decay channel. The anisotropy, characterized by the second Fourier harmonic $v_{2}$ coefficient, is determined using the two-particle correlation technique, where the $\Upsilon\textrm{(1S)}$ mesons are correlated with charged hadrons. A large pseudorapidity gap is used to suppress short-range correlations. The $v_{2}$ values are measured in four transverse momentum intervals in the range from 0 to 30 $\textrm{GeV}/c$. No azimuthal anisotropy is observed for the $\Upsilon\textrm{(1S)}$ mesons in high-multiplicity pPb collisions, which is consistent with previous lead-lead collision results.