Abstract
In this article the main longitudinal spin results of COMPASS are shown: the flavour separation of light quark helicities and the gluon polarisation Δg/g in the nucleon. The discussion of the former is focused on Δs and includes the topic of hadron multiplicities. New results of Δg/g using an open charm analysis are shown at LO and at NLO in QCD. This analysis combines both deuteron and proton data over the full range of Q2. A new LO result of Δg/g obtained from the analysis of high-pT hadron pairs for Q2 > 1 (GeV/c)2 is also presented. This result, obtained from deuteron data alone, is separated in 3 points of xg. Both methods use the photon-gluon fusion (PGF) process.
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