SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Hadron Structure and Spectroscopy III
HK 29.4: Vortrag
Mittwoch, 22. März 2023, 15:00–15:15, SCH/A316
Partial-Wave Analysis of the ππω Final State at COMPASS* — •Philipp Haas for the COMPASS collaboration — Physik-Department, Technische Universität München
The COMPASS experiment is a multi-purpose fixed-target experiment at the CERN SPS. One of its major goals is to study the light-meson spectrum with high precision. Of special interest is the search for so-called exotic mesons which cannot be described as quark-antiquark states. To this end, COMPASS has acquired large data samples on diffractive production of excited light mesons by scattering a 190 GeV/c π− beam off a proton target. Using this data set, COMPASS studied the π1(1600), which is a promising candidate for a so-called spin-exotic hybrid meson in great detail in the ηπ, η′π, and ρπ decay modes. However, lattice QCD predicts that the π1(1600) dominantly decays into b1(1235)π.
The b1(1235)π decay mode has so far not been studied at COMPASS. As b1(1235) dominantly decays into ω(782)π, a partial-wave analysis of ωππ including the ω→3π decay is necessary to access the b1(1235)π decay mode. We will present our development of a partial-wave analysis of the ωππ final state. We will focus on modeling the ω(782) decay in the partial-wave analysis.
* funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 390783311 and BMBF Verbundforschung 05P21WOCC1 COMPASS.