Elliptic flow coefficients from transverse momentum conservation

TL;DR

This paper calculates azimuthal cumulants from transverse momentum conservation, showing they can be significant even in large particle systems, impacting the understanding of collectivity in small systems.

Contribution

It provides a theoretical calculation of multi-particle azimuthal cumulants due to momentum conservation, highlighting their importance in small system collectivity studies.

Findings

$c_2\{k\}>0$ for all tested $k$

Cumulants can reach large values depending on transverse momenta

Results influence interpretations of collectivity in small systems

Abstract

We calculate the $k$-particle ($k=2,4,6,8$) azimuthal cumulants resulting from the conservation of transverse momentum. We find that $c_2\{k\}>0$ and depending on the transverse momenta, $c_2\{k\}$ can reach substantial values even for a relatively large number of particles. The impact of our results on the understanding of the onset of collectivity in small systems is emphasized.