Measurements of the gluon polarization ∆G G via the open charm channel and based on the helicity asymmetry of large transverse-momentum hadrons in the final state are presented. The data have been collected in the years 2002-2004 by the COMPASS experiment at CERN using a 160 GeV/c polarized muon beam scattered off a polarized 6LiD target. The new result for ∆G G from the charm channel is −0.57 ...

........................................................................................................................................... 2 INTRODUCTION .................................................................................................................................. 3 INERTIAL SENSORS ...............................................................................................

We investigate the polarized gluon distribution ∆g(x) by a global analysis of current DIS data and the π 0 data from RHIC-Spin experiments. The π 0 data provide a strong constraint on ∆g(x), so that its uncertainty is reduced. Furthermore, new DIS data of COMPASS and HERMES play an important role in determining ∆g(x) at large x.

New experiments in polarised deep inelastic scattering will mainly concentrate on the measurement of semi-inclusive asymmetries. Especially, the upgraded HERMES experiment at DESY and the newly build COMPASS experiment at CERN will investigate the gluon polarisation via open charm and high pT hadron pair production , study in detail the flavour decomposition of the quark helicity distributions ...

We give predictions for the leading order amplitudes for deeply virtual Compton scattering and hard meson electroproduction reactions at large Q in the valence region in terms of skewed quark distributions. We give first estimates for the power corrections to these leading order amplitudes. In particular, we outline examples of experimental opportunities to access the skewed parton distribution...

The convergent optimization via most promising area stochastic search (COMPASS) algorithm is a locally convergent randomsearch algorithm for solving discrete optimization via simulation problems. COMPASS has drawn a significant amount of attention since its introduction. While the asymptotic convergence of COMPASS does not depend on the problem dimension, the finite-time performance of the algo...

The hippocampal formation (HF) plays a crucial role in amniote spatial cognition. There are also indications of functional lateralization in the contribution of the left and right HF in processes that enable birds to navigate space. The experiments described in this study were designed to examine left and right HF differences in a task of sun compass-based spatial learning in homing pigeons (Co...