Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Hadron Structure and Spectroscopy IV
HK 34.1: Vortrag
Mittwoch, 12. März 2025, 17:30–17:45, HS 3 Physik
Partial-Wave Analysis of the ωππ Final State at COMPASS* — •Philipp Haas for the COMPASS collaboration — Technische Universität München
The study of mesons beyond qq configurations is of core interest in meson spectroscopy to extend our understanding of QCD. In the non-strange light-meson sector the π1(1600) is the only established of those, so-called exotic, mesons. The COMPASS experiment studied the π1(1600) in great detail in the ρ(770)π, ηπ, and η′π final states and greatly contributed to the foundation of the π1(1600). Recent lattice QCD calculations predict the b1(1235)π decay mode as dominant decay channel with a partial decay width more than 10 times larger than all other decay channels. Further, the decay π1(1600)→ρ(770)ω is predicted to be negligible. Both the b1(1235)π and ρ(770)ω decay prominently to the ωππ final state. Thus, the analysis of ωππ allows the study of the π1(1600) in its supposedly dominant decay and verification of lattice QCD predictions.
In this talk we present results of the partial-wave analysis of the ωπ−π0 final state in COMPASS data. Using the so-far largest ωππ dataset allows an analysis of this challenging final state of unmatched precision. We study the decays of π1(1600) to b1(1235)π and ρ(770)ω. Further, we extract resonance parameters and measure decay modes of multiple states, including poorly known ones.
* funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 390783311.
Keywords: Partial-Wave Analysis; COMPASS; omega pi pi; Light-meson spectroscopy; PWA