Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

Understand

The gluon polarisation in the nucleon was measured using open charm production by scattering 160 GeV/c polarised muons off longitudinally polarised protons or deuterons.

• The data were taken by the COMPASS collaboration between 2002 and 2007.
• A detailed account is given of the analysis method that includes the application of neural networks.
• Several decay channels of D^0 mesons are investigated.