Partial-Wave Analysis of the 𝜔𝜋𝜋 Final State at COMPASS

by Philipp Haas

Thursday 13 Nov 2025, 09:30 → 10:30 Europe/Berlin

E18/ENE Seminar Room 3268 (TUM PH)

The COMPASS experiment was a fixed-target experiment at the CERN SPS. As part of its hadron spectroscopy program,
COMPASS recorded the so far largest data set of the diffractively produced $\omega(782)\pi^-\pi^0$ final state
containing 720,000 events. This talk gives an overview of the efforts to study this final state in great detail during the
last years. Using a conventional partial-wave analysis (PWA), we study the light-meson spectrum of $a$ and $\pi$ mesons.
Of particular interest is the measurement of the spin-exotic $\pi_1(1600)$ in its presumably dominant decay channel and
the first observation of several decay modes of different light mesons.
In addition, through the application of the freed-isobar PWA method, we measure $b$ and $\rho$ mesons.