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A new subevent cumulant method was recently developed, which cansignificantly reduce the non-flow contributions in long-range correlations forsmall systems compared to the standard cumulant method. In this work, we studymulti-particle cumulants in $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}} =5.02$ TeV with a multiphase transport model (AMPT), including two- andfour-particle cumulants ($c_{2}\{2\}$ and $c_{2}\{4\}$) and symmetric cumulants[SC(2, 3) and SC(2, 4)]. Our numerical results show that $v_{2}\{2\}$ isconsistent with the experimental data, while the magnitude of $c_{2}\{4\}$ issmaller than the experimental data, which may indicate either the collectivityis underestimated or some dynamical fluctuations are absent in the AMPT model.For the symmetric cumulants, we find that the results from the standardcumulant method are consistent with the experimental data, but those from thesubevent cumulant method show different behaviors. The results indicate thatthe measurements from the standard cumulant method are contaminated by non-floweffects, especially when the number of produced particles is small. Thesubevent cumulant method is a better tool to explore the $real$ collectivity insmall systems.

Multiparticle azimuthal cumulants in p+Pb collisions from a multiphase transport model