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The COMPASS experiment at CERN SPS has taken data with a polarised muon beam scattering off a polarised NH3 target in 2011. The beam energy has been increased to 200GeV compared to 160GeV in 2007 and thus, higher values of Q2 and lower values of x are reached. From these data the longitudinal double spin asymmetry A1 and the spin-dependent structure function g1 are extracted. The results are used in a NLO QCD fit to the world data to obtain the polarised parton distributions and also to test the Bjorken sum rule, connecting the integral of the non-singlet structure function with the ratio of the weak coupling constants.

New COMPASS results on the spin structure function $g_1^p$, and QCD fit