Exploring the origin of D0 meson elliptic flow in PbPb collisions at √(sNN) = 5.02 TeV using event shape engineering
Abstract
The influence of the initial-state geometry on the elliptic flow of prompt D0 mesons in high-energy heavy ion collisions is explored. A lead-lead (PbPb) data sample at a center-of-mass energy per nucleon pair of 5.02 TeV and with an integrated luminosity of 0.607 nb−1 was collected in 2018 with the CMS detector at the CERN LHC. Based on these data, an event-shape engineering technique is used to isolate collisions with similar geometrical properties. An asymmetry parameter, q2, is first determined from the distribution of transverse energy in the forward region of the detector. This parameter is shown to be linearly correlated with the elliptic anisotropy of inclusive charged particles measured near mid-rapidity, as characterized by the second-order Fourier coefficients, v2. Taking the charged particle v2 coefficients as proxies for the initial-state eccentricity, the correlation of D0 meson v2 values near mid-rapidity with those of inclusive charged particles is then studied. For D0 mesons with transverse momenta in the range of 2−30 GeV and for different degrees of collision overlap, the v2 values are found strongly correlated with those for charged particles when selected based on similar q2 intervals. This correlation suggests that the initial-state geometry substantially impacts the development of charm-hadron flow in heavy ion collisions. A model calculation that explores the thermalization and collective motion of D0 mesons and charged particles is compared to the experimental results.
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BibTeX
@misc{collaboration2026exploring,
title = {{Exploring the origin of D$^0$ meson elliptic flow in PbPb collisions at $\sqrts_\mathrmNN$ = 5.02 TeV using event shape engineering}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.11017},
eprint = {2607.11017},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.11017},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Exploring the origin of D^0 meson elliptic flow in PbPb collisions at √(s_NN) = 5.02 TeV using event shape engineering
AU - CMS Collaboration
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2607.11017
UR - https://arxiv.org/abs/2607.11017
AB - The influence of the initial-state geometry on the elliptic flow of prompt D^0 mesons in high-energy heavy ion collisions is explored. A lead-lead (PbPb) data sample at a center-of-mass energy per nucleon pair of 5.02 TeV and with an integrated luminosity of 0.607 nb^−1 was collected in 2018 with the CMS detector at the CERN LHC. Based on these data, an event-shape engineering technique is used to isolate collisions with similar geometrical properties. An asymmetry parameter, q_2, is first determined from the distribution of transverse energy in the forward region of the detector. This parameter is shown to be linearly correlated with the elliptic anisotropy of inclusive charged particles measured near mid-rapidity, as characterized by the second-order Fourier coefficients, v_2. Taking the charged particle v_2 coefficients as proxies for the initial-state eccentricity, the correlation of D^0 meson v_2 values near mid-rapidity with those of inclusive charged particles is then studied. For D^0 mesons with transverse momenta in the range of 2−30 GeV and for different degrees of collision overlap, the v_2 values are found strongly correlated with those for charged particles when selected based on similar q_2 intervals. This correlation suggests that the initial-state geometry substantially impacts the development of charm-hadron flow in heavy ion collisions. A model calculation that explores the thermalization and collective motion of D^0 mesons and charged particles is compared to the experimental results.
ER -