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Recently CMS Collaboration measured mixed-harmonic four-particle azimuthalcorrelations, known as symmetric cumulants SC(n,m), in pp and pPb collisions,and interpreted the non-zero SC(n,m) as evidence for long-range collectivity inthese small collision systems. Using the PYTHIA and HIJING models which do nothave genuine long-range collectivity, we show that the CMS results, obtainedwith standard cumulant method, could be dominated by non-flow effectsassociated with jet and dijets, especially in $pp$ collisions. We show that thenon-flow effects are largely suppressed using the recently proposed subeventcumulant methods by requiring azimuthal correlation between two or morepseudorapidity ranges. We argue that the reanalysis of SC(n,m) using thesubevent method in experiments is necessary before they can used to providefurther evidences for a long-range multi-particle collectivity and constraintson theoretical models in small collision systems.

Importance of non-flow in mixed-harmonic multi-particle correlations in small collision systems