Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Hadron Structure and Spectroscopy II

HK 8.1: Group Report

Monday, February 26, 2018, 16:30–17:00, HZO 50

Spin Density Matrix Elements in Exclusive Omega Meson Production at COMPASS — Horst Fischer, Matthias Gorzellik, and •Philipp Jörg — Albert-Ludwigs-Universität Freiburg, on behalf of the COMPASS collaboration

A major part of the COMPASS-II program is dedicated to the investigation of generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs), which aim for the most complete description of the partonic structure of the nucleon.

GPDs are experimentally accessible via lepton-induced exclusive reactions, in particular the Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP). At COMPASS, those processes are investigated using a high intensity muon beam with a momentum of 160 GeV/c impinging on a 2.5 m-long liquid hydrogen target. To ensure the exclusivity and precision of the measurement, wide angle electromagnetic calorimetry together with a two-stage magnetic spectrometer is used.

Exploiting the flavour filtering character of DVMP measurements, the COMPASS experiment is able to access different combinations of quark and gluon GPDs by studying the exclusive production of various mesons. We report on the extraction of spin density matrix elements in exclusive ω production.
*Supported by BMBF and the DFG Research Training Group Programme 2044.