We measured the longitudinal double spin asymmetries $A_{LL}$ for single
hadron muo-production off protons and deuterons at photon virtuality $Q^2$ <
1(GeV/$it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7
GeV/$it c$ to 4 GeV/$it c$ . They were determined using COMPASS data taken
with a polarised muon beam of 160 GeV/$it c$ or 200 GeV/$it c$ impinging on
polarised $mathrm{{}^6LiD}$ or $mathrm{NH_3}$ targets. The experimental
asymmetries are compared to next-to-leading order pQCD calculations, and are
sensitive to the gluon polarisation $Delta G$ inside the nucleon in the range
of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$.
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