A remark on the sign change of the four-particle azimuthal cumulant in small systems
arXiv:1801.01277 · doi:10.1016/j.physletb.2018.03.068
Abstract
The azimuthal cumulants, $c_2\{2\}$ and $c_2\{4\}$, originating from the global conservation of transverse momentum in the presence of hydro-like elliptic flow are calculated. We observe the sign change of $c_2\{4\}$ 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.
8 pages, 2 figures; PLB version, less equations, experimental points added