For the first time, correlations among mixed-order moments of two or three flow harmonics $-$($v_{ n}^{ k},v_{ m}^{ l}$) and ($v_{ n}^{ k},v_{ m}^{ l}, v_{ p}^{ q}$), with $k$, $l$, and $q$ denoting the respective orders$-$are measured in xenon-xenon (XeXe) collisions and compared with lead-lead (PbPb) results, providing a novel probe of collective behavior in heavy ion collisions. These measurements compare a nearly spherical, doubly-magic ${ }^{ 208}$Pb nucleus to a triaxially deformed ${ }^{ 129}$Xe nucleus, emphasizing the sensitivity to dynamic nuclear deformation. The dependence of these results ($v_{ n}$, $n$ = 2, 3, 4) on the shape and size of the nuclear overlap region is studied. Comparisons between $v_{ 2}$, $v_{ 3}$, and $v_{ 4}$ demonstrate the importance of $v_{ 3}$ and $v_{ 4}$ in exploring the nonlinear hydrodynamic response of the quark-gluon plasma (QGP) to the initial spatial anisotropy. The results constrain initial-state model parameters that influence the evolution of the QGP. The CMS detector was used to collect XeXe and PbPb data at nucleon-nucleon center-of-mass energies of $\sqrt{ s_\mathrm{ NN}}$ = 5.44 and 5.36 TeV, respectively. Correlations are extracted using multiparticle mixed-harmonic cumulants (up to eight-particle cumulants) with charged particles in the pseudorapidity range $\lvert\eta\rvert$ $\lt$ 2.4 and transverse momentum range 0.5 $\lt$ $p_\mathrm{ T}$ $\lt$ 3 GeV/$c$.
Categories: nucl-ex hep-ex
