Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-HIN-25-009 | ||
| Collective flow in OO and NeNe collisions at $ \sqrt{s_{_{NN}}} = $ 5.36 TeV | ||
| CMS Collaboration | ||
| 2025-09-08 | ||
| Abstract: The collective flow in oxygen-oxygen (OO) and neon-neon (NeNe) collisions provide important information about the origin of collectivity in small collision systems. They also serve as probes for nuclear structure of O and Ne nuclei. The elliptic ($ v_{2} $) and triangular ($ v_{3} $) flow harmonics of charged particles from two-particle correlations, as well as $ v_{2} $ values from four-particle correlations, are measured as functions of the nuclear overlap from peripheral to central OO and NeNe collisions at a center-of-mass energy per nucleon pair of $ \sqrt{s_{_{NN}}} = $ 5.36 TeV. The data were obtained with the CMS detector at the LHC and correspond to integrated luminosity of 7 nb$^{-1} $ for OO collisions and 0.8 nb$^{-1} $ for NeNe collisions. The $ v_2 $ values show a similar trend as previously observed in PbPb collisions where the values decrease towards central collisions, reflecting the initial geometry of the overlapping area of the AA collisions. An increasing trend is observed for $ v_{3} $ values from peripheral to central collisions, in contrast with the observation in PbPb collisions, indicating different initial state fluctuations in small and large collision systems. The ratio of NeNe to OO $ v_{2} $ values shows a significant increasing trend towards central collisions, while the $ v_{3} $ ratio shows a decreasing trend. A comparison of hydrodynamic models that include $ ab $ $ initio $ nuclear structure conditions to these results provides important information on how the collective flow is influenced by the initial collision geometry in small collision systems, including how the nuclear deformation and $ \alpha $-clustering in O and Ne nuclei affects the resulting bulk dynamics. | ||
|
Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
||
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|