Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Hadron Structure and Spectroscopy III
HK 29.2: Vortrag
Mittwoch, 12. März 2025, 16:15–16:30, HS 3 Physik
Partial-wave decomposition of the diffractively produced π−π+π−η final state at COMPASS — •David Spülbeck1, Henri Pekeler1, Philipp Haas2, Mikhail Mikhasenko3, and Bernhard Ketzer1 for the COMPASS collaboration — 1Universität Bonn — 2Technische Universität München — 3Universität Bochum
The COMPASS experiment at the CERN SPS was a versatile fixed-target experiment that collected data between 2002 and 2022. The data support a rich physics program from hadron structure to spectroscopy. The latter includes the study of light isovector mesons with total spin J, i.e., aJ and πJ, produced through diffractive scattering of a 190 GeV/c π− beam off a liquid-hydrogen target. Large data sets of multiparticle exclusive final states containing charged and neutral particles were recorded, providing also unique opportunities to study the spin-exotic meson π1(1600).
We present the first partial-wave decomposition of the π−π+π−η final state, which spans a wide range of decay channels, such as f1(1285)π−, a2−(1320)η, and ρ(770)a0−(980). Most of these channels are studied for the first time with COMPASS data. This analysis also includes decay channels predicted by theoretical models for the lightest hybrid meson, providing the opportunity to verify the hybrid meson hypothesis of the π1(1600).
Supported by BMBF.
Keywords: spectroscopy; exotic mesons; hybrid mesons; light quarks