Speaker
Description
The purpose of COMPASS is the study of hadron structure
and hadron spectroscopy with high intensity muon and hadron beams.
The Collaboration is formed by about 200 physicists from 25 countries.
The facility was approved 25 years ago and the physics experiments
started in 2002 with a muon beam, polarised proton and deuteron
targets. These semi-inclusive deep inelastic scattering (SIDIS)
reveals a detailed quark-gluon structure of the nucleon, in particular
the gluon polarisation and transverse-momentum-dependent correlations.
The years 2008 and 2009 were dedicated to the hadron spectroscopy
programme with pion and proton beams scattering off a liquid
hydrogen target and nuclear targets. An unprecedented amount
of data was collected and showed subtle details
of the light-meson spectrum. A dedicated study of the pion
polarisability using Primakoff scattering of pions from heavy nuclei
was also performed.
Phase II of COMPASS commenced in 2014 and is primarily devoted to
the transverse and 3D structure of nucleons using Deeply Virtual
Compton scattering (DVCS), Hard Exclusive Meson Production (HEMP),
SIDIS and polarised Drell-Yan (DY) reactions.
A panorama of the recent COMPASS results will be presented.
| speaker affiliation | Faculty of Physics, University of Warsaw |
|---|
