# XX International Workshop on Deep-Inelastic Scattering and Related Subjects

Mar 26 – 30, 2012
University of Bonn
Europe/Berlin timezone

## New COMPASS Results on Polarized Parton Distributions Inside the Nucleon

Mar 27, 2012, 10:00 AM
25m
Lecture Hall, Institute for Physical Chemistry (University of Bonn)

Spin physics

### Speaker

Marcin Stolarski (LIP Laboratorio de Instrumentacao e Fisica Experimental de Part)

### Description

A short review of the COMPASS results concerning gluon polarization inside the nucleon, DG/G, is given including two new measurements: Firstly, a DG/G determination in leading order and in three bin of the gluon momentum fraction x_g from asymmetries in high-p$_T$ hadron pair production for Q$^2>$1 (GeV/c)$^2$; secondly, a preliminary next-to-leading order analysis based on open charm production, i.e. D mesons decaying via various channels. The latter result is obtained from our combined proton and deuteron data. In addition the cross-section for the $D^*$ production is given and kinematic distribution of the $D^*$ are compared with the AROMA generator. Finally results for the LO flavor separation of the three lightest quark polarized parton distributions.

### Primary author

Marcin Stolarski (LIP Laboratorio de Instrumentacao e Fisica Experimental de Part)

### Presentation materials

 Proceedings Slides