Final results from the NMC

A summary of the results on deep inelastic muon nucleon and muon nucleus scattering experiments performed by the NMC collaboration is presented.Comment: 5 pages, LaTex Contribution to the working group I of DIS97, Chicago, April 1997 Proccedings to be published by AI

COMPASS - a facility to study QCD

An overview on the new COMPASS II experimental programme is presented. The main topics include a study of Primakoff reactions, generalised parton distributions via deeply virtual Compton scattering and transverse momentum dependent distributions in Drell-Yan processes in the pion scattering off polarised protons. Moreover, the studies of semi-inclusive deep inelastic scattering on unpolarised target will be continued.Comment: 4 pages, 2 figures, LaTeX, Contribution to Hadron2011 Conference Proceedings, to appear in the proceedings of the XIV International Conference on Hadron Spectroscopy: Hadron 2011, Munich, Germany, 13-17 June 201

Results on the nucleon spin structure

SMC performed an investigation of the spin structure of the nucleon by measuring deep inelastic scattering of polarised muons off polarised protons and deuterons. A summary of the results for spin structure functions and sum rules is given.Comment: 8 pages, LaTeX, Talk given at the Workshop on "Symmetry and Spin - PRAHA98", Prag, September 1998. Proceedings to be published by Czech. Journ. Phy

Project for a DVCS measurement at COMPASS

The high energy polarised muon beam available at CERN with the option of using positive or negative muons with opposite polarisation gives COMPASS an excellent possibility to study generalised parton distributions via deeply virtual Compton scattering. In a first step we propose to use an unpolarised proton target to study the slope of the $t$ dependence of the differential cross section as a function of $x_{Bj}$ to observe a possible shrinkage of the nucleon with increasing $x_{Bj}$. Furthermore, the beam charge and spin difference will be measured over a wide kinematical range to determine the Compton form factor related to the GPD $H$. As a second step we consider to use a transversely polarised proton target to collect data to constrain the GPD $E$. In preparation of the future measurements two DVCS test runs were performed in 2008 and 2009