First measurements of mixed-order multiparticle cumulants of flow harmonics v2, v3, and v4 in XeXe collisions at 5.44 TeV compared to PbPb at 5.36 TeV show sensitivity to nuclear deformation and nonlinear hydrodynamic response.
Observation of correlated azimuthal anisotropy Fourier harmonics in pp and pPb collisions at the LHC
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abstract
The azimuthal anisotropy Fourier coefficients ($v_n$) in 8.16 TeV pPb data are extracted via long-range two-particle correlations as a function of event multiplicity and compared to corresponding results in pp and PbPb collisions. Using a four-particle cumulant technique, $v_n$ correlations are measured for the first time in pp and pPb collisions. The $v_2$ and $v_4$ coefficients are found to be positively correlated in all collision systems. For high multiplicity pPb collisions an anticorrelation of $v_2$ and $v_3$ is observed, with a similar correlation strength as in PbPb data at the same multiplicity. The new correlation results strengthen the case for a common origin of the collectivity seen in pPb and PbPb collisions in the measured multiplicity range.
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VAH simulations in (2+1)D Bjorken flow with transverse expansion show an extended applicability domain over standard viscous hydrodynamics when compared to relaxation-time approximation kinetic theory.
CMS measures V_nΔ in pPb events at √s_NN = 8.16 TeV as a function of forward rapidity gap width, p_T, and multiplicity in γPb and IP Pb enriched samples, comparing to prior pp, pPb, and γp data plus event generators.
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Dependence of two-particle azimuthal correlations on the forward rapidity gap width in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV
CMS measures V_nΔ in pPb events at √s_NN = 8.16 TeV as a function of forward rapidity gap width, p_T, and multiplicity in γPb and IP Pb enriched samples, comparing to prior pp, pPb, and γp data plus event generators.