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 $J^P=0^{-}$.

Talk presented at 17th International Workshop on Meson Physics in KRAKÓW, POLAND, 22nd - 27th June 2023