D Meson Sensitivity to a System Size Scan at LHC

Abstract

Experimental measurements in pA collisions indicate no ${\text {D}}$ meson suppression ($R_{{{\text {p}}\text {Pb}}} \sim 1$) but a surprisingly large $v_2$. To better understand these results we propose a system size scan at the LHC involving $^{16}{\text {OO}}$, $^{40}{\text {ArAr}}$, $^{129}{\text {XeXe}}$ and $^{208}{\text {PbPb}}$ collisions. Using Trento+ v-USPhydro+DAB-MOD to make predictions, we find that the $R_{\text {AA}}$ tends towards unity when the system size is decreased, but nonetheless, in the most central collisions $v_{2}\{2\}$ is almost independent of the colliding system. These results are analyzed in light of path length and initial eccentricity variations.