Speaker
Eva-Maria Kabuss
(Johannes Gutenberg-Universitat)
Description
The COMPASS experiment at CERN performs a rich program in inclusive (DIS) and
semi-inclusive (SIDIS) deep inelastic scattering of longitudinally polarised
muons off longitudinally polarised nucleons. The main topic is the
investigation of the spin structure of the nucleon in terms
of quark and gluon polarisations. For the extraction of the contribution
of the different quarks flavours to the nucleon spin, in addition to
the well known spin-averaged quark distributions the fragmentation functions
of quarks into hadrons are needed. Especially the information on the strange
quark fragmentation is scarce. Thus, COMPASS is also extracting fragmentation
functions from the multiplicities of identified hadrons.
An overview on recent COMPASS results will be given, including the
longitudinal spin structure function and a NLO QCD fit,
a verification of the Bjorken sum rule, pion and kaon multiplicities,
and the latest results on the gluon polarisation.
