A remark on the sign change of the four-particle azimuthal cumulant in small systems
Abstract
The azimuthal cumulants, c2\2\ and c2\4\, originating from the global conservation of transverse momentum in the presence of hydro-like elliptic flow are calculated. We observe the sign change of c2\4\ for small number of produced particles. This is in a qualitative agreement with the recent ATLAS measurement of multi-particle azimuthal correlations with the subevent cumulant method.
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