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Observation of long-range collective flow in OO and NeNe collisions and implications for nuclear structure studies

The CMS collaboration
Hayrapetyan, Aram , Makarenko, Vladimir , Tumasyan, Armen , Adam, Wolfgang , Benato, Lisa , Bergauer, Thomas , Dragicevic, Marko , Giordano, Cristina , Hussain, Priya Sajid , Jeitler, Manfred
CMS-HIN-25-009, 2025.
https://doi.org/10.17182/hepdata.165513.v1

Abstract
The long-range collective flow of particles produced in oxygen-oxygen (OO) and neon-neon (NeNe) collisions is measured with the CMS detector at the CERN LHC. The data samples were collected at a center-of-mass energy per nucleon pair of 5.36 TeV, with integrated luminosities of 7 nb$^{-1}$ and 0.8 nb$^{-1}$ for OO and NeNe collisions, respectively. Two- and four-particle azimuthal correlations are measured over nearly five units of pseudorapidity. Significant elliptic ($v_2$) and triangular ($v_3$) flow harmonics are observed in both systems. The ratios of $v_n$ coefficients between NeNe and OO collisions reveal sensitivity to quadrupole correlations in the nuclear wave functions. Hydrodynamic models with $\textit{ab initio}$ nuclear structure inputs qualitatively reproduce the collision-overlap dependence of both the $v_n$ values and the NeNe to OO ratios. These measurements provide new constraints on hydrodynamic models for small collision systems and offer valuable input on the nuclear structure of $^{16}$O and $^{20}$Ne.

  • Table 1

    Data from Figure 1 Left

    10.17182/hepdata.165513.v1/t1

    The $v_{2}\{2,\lvert\Delta\eta\rvert>2\}$, $v_{3}\{2,\lvert\Delta\eta\rvert>2\}$ and $v_{2}\{4\}$ values for charged particles as functions of centrality in OO collisions at 5.36 TeV.

  • Table 2

    Data from Figure 1 Right

    10.17182/hepdata.165513.v1/t2

    The $v_{2}\{2,\lvert\Delta\eta\rvert>2\}$, $v_{3}\{2,\lvert\Delta\eta\rvert>2\}$ and $v_{2}\{4\}$ values for charged particles as functions of centrality in NeNe collisions at 5.36 TeV.

  • Table 3

    Data from Figure 2 Left

    10.17182/hepdata.165513.v1/t3

    The $v_{2}\{2,\lvert\Delta\eta\rvert>2\}$ and $v_{2}\{4\}$ ratios for charged particles as functions of centrality in NeNe to OO collisions at 5.36 TeV.

  • Table 4

    Data from Figure 2 Right

    10.17182/hepdata.165513.v1/t4

    The $v_{3}\{2,\lvert\Delta\eta\rvert>2\}$ ratios for charged particles as functions of centrality in NeNe to OO collisions at 5.36 TeV.

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