Exotic Meson candidates in COMPASS data

Abstract

One of the prime goals of the COMPASS experiment at CERN is the study of the light meson spectrum, with a particular emphasis on the search for exotic states. The focus of this paper is on signals of the lightest hybrid candidate $\pi_1(1600)$ with spin-exotic quantum numbers $J^{PC}=1^{-+}$ in several decay channels such as $\pi^-\pi^+\pi^-$, $\eta^{(\prime)}\pi^-$, $\omega\pi^-\pi^0$, $\pi^-\pi^+\pi^-\eta$, and $K_S K_S \pi$. In addition, we highlight new results for the $K^-\pi^+\pi^-$ final state, which indicate a supernumerary state with respect to the constituent quark model with $J^{P}=0^-$.