Characterizing the initial state and dynamical evolution in XeXe and PbPb collisions using multiparticle cumulants

Abstract

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 initial-state geometry fluctuations arising from 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 $|\eta |$ $<$ 2.4 and transverse momentum range 0.5 $<$ $p_{\mathrm{T}}$ $<$ 3 GeV/$c$.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-24-004 (CMS Public Pages)

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