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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Invited Talks III

HK 41.1: Hauptvortrag

Donnerstag, 2. April 2020, 11:00–11:30, H-HS X

Highlights from the COMPASS Experiment and the COMPASS++/AMBER Proposal — •Boris Grube for the COMPASS collaboration — Physik-Department E18, Technische Universität München

With COMPASS, the largest multi-purpose fixed-target spectrometer setup at the CERN Super Proton Synchrotron, the structure and spectrum of hadrons is investigated by scattering high-energetic hadrons and polarized muons off various targets. The broad physics program aims at a better understanding of the strong interaction, which is theoretically described by quantum chromodynamics (QCD). The studied processes include soft reactions of hadrons to test the breaking of the chiral symmetry of QCD, production and decay of meson resonances to perform detailed studies of the excitation spectrum of light-quark mesons, and scattering of high-energy muons and pions off nucleons to unravel the role of spin and internal dynamics of the quark-gluon structure in the nucleon. We will present highlights from recent analyses.

Based on the very successful running of COMPASS, the new COMPASS++/AMBER experiment was proposed recently. The physics program entails a wide variety of measurements addressing fundamental questions of QCD. We will discuss the first part of the proposed program, which is intended to start 2021 and aims, among other things, at a measurement of the proton radius via elastic scattering of high-energetic muons in order to shed more light on the proton-radius puzzle.