Exotic Meson candidates in COMPASS data

Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany

^* e-mail: david.benjamin.spulbeck@cern.ch

Published online: 16 February 2024

Abstract

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 can didate π₁(1600) with spin-exotic quantum numbers J^PC = 1⁻⁺ in several decay channels such as π⁻π⁺π⁻, r^wπ⁻, ωπ⁻π⁰, π⁻π⁺π⁻η, and K_SK_Sπ. In addition, we highlight new results for the K⁻π⁺π⁻ final state, which indicate a supernumerary state with respect to the constituent quark model with J^P = 0⁻.