Study of $J/\psi$ and $\psi(\mathrm{2S})$ production in $\sqrt{s_{_\text{NN}}} = 5.02\mathrm{~TeV}$ $p+\rm{Pb}$ and $\sqrt{s} = 2.76\mathrm{~TeV}$ $pp$ collisions with the ATLAS detector

Measurements of $J/\psi$ and $\psi({\mathrm{2S}})$ production in proton-lead collisions at proton-nucleon center-of-mass energy of $\sqrt{s_{_\text{NN}}} = 5.02~\mathrm{TeV}$ and in proton-proton collisions at center-of-mass energy of $\sqrt{s} = 2.76~\mathrm{TeV}$ are presented. The measurements are based on data recorded in 2013 with the ATLAS detector, corresponding to integrated luminosities of $28.1~\mathrm{nb}^{-1}$ and $4.0~\mathrm{pb}^{-1}$ in $p+{\mathrm{Pb}}$ and $pp$, respectively. Measurements of differential cross sections and nuclear modification factors are presented for the di-muon decay channel in the center-of-mass rapidity interval $-1.5 < y^*_{\mu\mu} < 1.5$, over the range $8.5 < p_{\mathrm{T}}^{\mu\mu}< 30~\mathrm{GeV}$.