Abstract
An overview about recent results from deep inelastic scattering of polarised leptons off polarised protons and neutrons is given. Described are inclusive measurements of the longitudinal spin structure functions, measurements of the photon gluon fusion process to extract the gluon polarisation and measurements with transversely polarised targets to determine the transverse quark distributions. A first measurement of the gluon polarisation via open charm production in the photon gluon fusion process was obtained recently by the COMPASS collaboration. An alternative approach used by several experiments makes use of high pT hadron pairs to tag the photon gluon fusion process. All results indicate that the gluon polarisation is either small or has a node for x around 0.1. In addition, recent results from proton‐proton collisions using longitudinal and transverse beam polarisations are discussed.
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