| Issue |
EPJ Web of Conferences
Volume 112, 2016
6th International Conference on Physics Opportunities at an Electron-Ion Collider
|
|
|---|---|---|
| Article Number | 01023 | |
| Number of page(s) | 6 | |
| Section | Spin and 3D Structure | |
| DOI | https://doi.org/10.1051/epjconf/201611201023 | |
| Published online | 21 March 2016 | |
https://doi.org/10.1051/epjconf/201611201023
Results on longitudinal spin physics at COMPASS
Universität Mainz, Institut für Kernphysik, Johann-Joachim-Becher-Weg 45, D 55128 Mainz
a e-mail: mwilfert@cern.ch
b Supported by BMBF and GRK Symmetry Breaking
Published online: 21 March 2016
The COMPASS experiment at the CERN SPS has taken data on deep inelastic scattering of polarised muons on a polarised NH3 target in 2007 and 2011 and on a polarised LiD target in 2002–2004 and 2006. The new results on the longitudinal double spin asymmetry A1p and the spin-dependent structure function g1p obtained from the 2011 data set are presented. These results are used in a NLO QCD fit to the world data to obtain the polarised parton distributions. Also an update of the results on the Bjorken sum rule, connecting the integral of the non-singlet spin-dependent structure function with the ratio of the weak coupling constants, will be given.
Direct access to the gluon polarisation is possible via the photon gluon fusion process in semi-inclusive deep inelastic scattering. This process is studied using the pT dependence of charged hadron asymmetries. The latest results indicate a positive gluon polarisation in the kinematic region of COMPASS
© Owned by the authors, published by EDP Sciences, 2016
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