Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Hadron Structure and Spectroscopy IX

HK 52.4: Talk

Wednesday, March 30, 2022, 16:45–17:00, HK-H8

The full COMPASS dataset of the diffractively produced η^(′)π⁻ final state — •Henri Pekeler, Simon Havemann, David Spülbeck, Mathias Wagner, and Bernhard Ketzer for the COMPASS collaboration — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

The diffractive production of the η^(′)π⁻ system in the p + π⁻→ η^(′)π⁻ + p channel is very exciting because the partial wave with orbital angular momentum L=1 between the two pseudoscalars carries spin-exotic quantum numbers J^PC=1⁻⁺. The observation of a resonance in this wave is considered a smoking gun for a hybrid meson with gluonic degrees of freedom.

Data for diffractive π⁻ proton scattering was taken by COMPASS in two different years. In the talk, we will present the full data set, which, together with recent improvements for the reconstruction, yields an increase of the data sample around a factor of 2 with respect to the data published previously by COMPASS, and around a factor of 4 compared to earlier data sets collected by the E852 collaboration. This allows us to perform a 2-dim. PWA in bins of the invariant mass and the 4-momentum transfer squared t.

Supported by BMBF.