Speaker
Vincent Andrieux
(CEA/IRFU, France)
Description
New results on the double spin asymmetry $A_1$ and the spin-dependent structure function of the proton $g_1^p$ as a function of $x_{Bj}$ and $Q^2$ will be presented. They rely on the DIS data collected in 2011 by the COMPASS Collaboration with a polarised muon beam of 200 GeV and a polarised $NH_3$ target. The high energy of the beam allows $A_1$ measurements down to $x_{Bj}$ = 0.0025 for the first time and extends the $Q^2$ range, which bring new inputs for QCD global fits of world data. The latest impact of the COMPASS data on the QCD fits will also be presented.
Author
Vincent Andrieux
(CEA/IRFU, France)
