System size scan of D meson $R_{\text{AA}}$ and $v_n$ using PbPb, XeXe, ArAr, and OO collisions at LHC

Abstract

Experimental measurements indicate no suppression (e.g. $R_{\text{pPb}}\sim 1$) but a surprisingly large D meson $v_2$ was measured in pPb collisions. In order to understand these results we use Trento+v-USPhydro+DAB-MOD to make predictions and propose a system size scan at the LHC involving ${}^{208}$PbPb, ${}^{129}$XeXe, ${}^{40}$ArAr, and ${}^{16}$OO collisions. We find that the nuclear modification factor approaches unity as the system size is decreased, but nonetheless, in the 0-10% most central collisions $v_2\{2\}$ is roughly equivalent regardless of system size. These results arise from a rather non-trivial interplay between the shrinking path length and the enhancement of eccentricities in small systems at high multiplicity. Finally, we also find a surprising sensitivity of D mesons $v_2\{2\}$ in 0-10% at $p_T=2-10$ GeV to the slight deformation of ${}^{129}$Xe recently found at LHC.

arXiv comment11 pages, 12 figures

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