Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Hadron Structure and Spectroscopy IX
HK 52.3: Vortrag
Mittwoch, 30. März 2022, 16:30–16:45, HK-H8
Study of the diffractively produced ππω Events at COMPASS — •Philipp Haas — Physik-Department E18, Technische Universität München
The COMPASS experiment is a multi-purpose fixed-target experiment at the CERN SPS. One of its major goals is the search for so-called exotic mesons that cannot be described as quark-antiquark states. To this end, COMPASS has acquired large data samples on diffractive production of exited light mesons by a 190 GeV/c π− beam on a proton target. The π1(1600) meson with spin, parity, and charge-conjugation quantum numbers JPC=1−+, which are forbidden for qq states, is a promising candidate for a hybrid meson and agrees with predictions from lattice QCD. Lattice QCD further predicts that the π1(1600) dominantly decays into b1(1235)π.
While π1(1600) signals have been found in the COMPASS data on ρ(770)π, ηπ, and η′π decay modes, the b1(1235)π channel has so far not been studied. We will present first results of an analysis of COMPASS data on the diffractive process π−p → π−π0ω(782)p, which includes the b1(1235)π channel. We performed an event selection resulting in a data sample of 730000 events. These data contain clear signals for b1(1235)→ω(782)π and will help us to study the π1(1600), and to verify the π1(2015) signal claimed by the BNL E852 experiment.