Strange-Meson Spectroscopy with COMPASS

• DOI: 10.48550/arxiv.2310.09249
• Publication Date: 2023-01-01
• Authors: S. Wallner
• Keywords: Compass; Hadron spectroscopy; Strange quark

While the spectrum of non-strange light mesons is well known, many predicted strange have not yet been observed, and potentially observed states require further confirmation. Using $K^-$ component hadron beam at M2 beamline CERN, we study strange-meson with COMPASS experiment. The flagship channel $K^-\pi^-\pi^+$ final state, for which has obtained world's largest sample. Based on this sample, performed most detailed comprehensive partial-wave analysis state to date. For example, observe a clear signal from well-known $K_2^*(1430)$, first time $K_2(1770)$, $K_2(1820)$, $K_2(2250)$ in single analysis. We also find evidence supernumerary called $K(1630)$, suggesting that pseudoscalar exotic meson.