Study of kaonic final states in $\pi^-p$ at $190\,\textrm{GeV}$

TL;DR

This paper analyzes kaonic final states produced in high-energy pion-proton scattering at CERN, presenting initial results on three-body structures around 1.8 and 2.2 GeV, contributing to understanding meson spectroscopy.

Contribution

It provides new experimental data and first analysis results on kaonic final states in pion-proton interactions at 190 GeV, highlighting observed structures in the mass spectrum.

Findings

Identification of two prominent three-body structures at 1.8 and 2.2 GeV

First results on diffractively produced $K\bar K\pi$ states

Observation of known $K\bar K$ and $K\pi$ decay channels

Abstract

We discuss the status of analyses of data recorded in the 2008 and 2009 runs of the COMPASS experiment at CERN with sepcific focus on final states with $K^0_S K^0_S \pi^-$ and $K^+K^-\pi^-$ produced in $\pi^-(190\,\textrm{GeV})p$ scattering. The interest in such final states is motivated by a summary of some of the relevant literature. We also show first results from the analysis of diffractively produced $K\bar K\pi$ states. Two prominent three-body structures, one around $1.8\,\GeV$, the other at $2.2\,\GeV$ decaying via known $K\bar K$ and $K\pi$ states are seen.