# System size scan of D meson RAA and vn using PbPb, XeXe, ArAr, and OO collisions

- Institution: CERN
- Department: Conferences
- Speaker: Jacquelyn Noronha-Hostler
- Year: 2020
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3000814)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Experimental measurements indicate no suppression (e.g. RpPb ∼ 1) but a surprisingly large D meson v2 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 v2{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 v2{2} in 0–10% at pT = 2–5 GeV to the slight deformation of 129Xe recently found at LHC..

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## Lectures

1. [System size scan of D meson RAA and vn using PbPb, XeXe, ArAr, and OO collisions](https://invisiblenetwork.ai/learn/cern/3000814/e1ff38b4be64), 27 min (CERN's player)