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The azimuthal anisotropy of charged particles produced in$\sqrt{s_{\mathrm{NN}}}=8.16$ TeV $p$+Pb collisions is measured with the ATLASdetector at the LHC. The data correspond to an integrated luminosity of $165$$\mathrm{nb}^{-1}$ that was collected in 2016. Azimuthal anisotropycoefficients, elliptic $v_2$ and triangular $v_3$, extracted using two-particlecorrelations with a non-flow template fit procedure, are presented as afunction of particle transverse momentum ($p_\mathrm{T}$) between $0.5$ and$50$ GeV. The $v_2$ results are also reported as a function of centrality inthree different particle $p_\mathrm{T}$ intervals. The results are reportedfrom minimum-bias events and jet-triggered events, where two jet $p_\mathrm{T}$thresholds are used. The anisotropies for particles with $p_\mathrm{T}$ lessthan about $2$ GeV are consistent with hydrodynamic flow expectations, whilethe significant non-zero anisotropies for $p_\mathrm{T}$ in the range $9$-$50$GeV are not explained within current theoretical frameworks. In the$p_\mathrm{T}$ range $2$-$9$ GeV, the anisotropies are larger in minimum-biasthan in jet-triggered events. Possible origins of these effects, such as thechanging admixture of particles from hard scattering and the underlying event,are discussed.

Transverse momentum and process dependent azimuthal anisotropies in $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV $p$+Pb collisions with the ATLAS detector