Measuring the Light-Meson Spectrum at COMPASS

by Julien Beckers (TUM)

Thursday 8 May 2025, 09:30 → 10:30 Europe/Berlin

E18/ENE Seminar Room 3268 (TUM PH)

COMPASS is a multi-purpose fixed-target experiment at the CERN SPS. One of its main goals is to probe the strong interaction at low energies by studying the excitation spectrum of light mesons. A wide range of light mesons are produced in diffractive scattering reactions of a high-energy pion beam on a proton target. Decomposing the data into partial-wave amplitudes allows us to measure the contributing mesonic states's quantum numbers, before extracting their resonance parameters.

We have collected the world's largest datasets of various final states. In this talk, we will focus on the $K_S^0$ $K^-$ final state, which allows us to study light mesons with isospin I=1 and spin-parity $J^{PC}$ = (even)$^{++}$ up to a high invariant mass range. 

We will discuss the analysis model and present new measurements of resonance parameters of several light mesons.