Compact Muon Solenoid
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| CMS-PAS-HIN-24-015 | ||
| Exploring the origin of $ \mathrm{D^0} $ meson elliptic flow in PbPb collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}= $ 5.02 TeV using event shape engineering | ||
| CMS Collaboration | ||
| 15 May 2025 | ||
| Abstract: The effect of the initial collision geometry on the elliptic flow ($ v_2 $) in events with prompt $ \mathrm{D^0} $ mesons produced in PbPb collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}= $ 5.02 TeV is studied using data from the CMS experiment. Using an event-shape engineering technique, initial-state eccentricities within a given centrality range are systematically varied. The $ v_2 $ of $ \mathrm{D^0} $ mesons is measured in five centrality classes, 0-10, 10-20, 20-30, 30-40 and 40-50$ % $ and further categorized into ten event-shape classes based on the reduced flow vector ($ q_2 $) within each centrality range. The measurement is performed within the kinematic region of $ \mathrm{D^0} $ rapidity, $ \lvert y \rvert < $ 1 and transverse momentum ($ p_{\mathrm{T}} $) of 2-30 GeV/$c$. A clear positive correlation is observed between the $ q_2 $ and the $ \mathrm{D^0} v_2 $, indicating that the initial-state geometry significantly influences the development of charm-hadron flow in heavy-ion collisions. Furthermore, a comparison between the $ v_2 $ of $ \mathrm{D^0} $ mesons and that of low-$ p_{\mathrm{T}} $ (1-3 GeV/$c$) charged particles reveals a linear correlation, strongly suggesting that initial-geometry eccentricity is the primary origin of the charm-hadron elliptic flow, and hints of nonlinearity are observed at $ \mathrm{D^0} p_{\mathrm{T}} > $ 10 GeV/$c$. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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