Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Hadronenstruktur und -spektroskopie
HK 37.3: Vortrag
Donnerstag, 20. März 2014, 14:30–14:45, HZ 1+2
Results on the longitudinal double spin asymmetry A1p and g1p from the 2011 COMPASS data — •Malte Wilfert — for the COMPASS collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, 55099 Mainz
The COMPASS experiment at the M2 beamline of the CERN SPS has taken data with a polarised muon beam scattering of a polarised NH3 target in 2011. The beam energy has been increased to 200 GeV compared to 160 GeV in 2007. With the increased beam energy it is possible to reach higher values of Q2 and lower values of xBj, compared to our first measurement in 2007. We will present our results on the longitudinal double spin asymmetry A1p and the spin-dependent structure function g1p from the 2011 data taking. This results will be used in a NLO QCD fit to the worlds data to obtain the polarised parton distributions and also to update our results on the validation of the Bjorken sum rule, connecting the integral of the non-singulet structure function with the ratio of the weak coupling constants.
Supported by BMBF under the contract 05P12UMCC1 and GRK Symmetry Breaking (DFG/GRK 1581)