Measurement of azimuthal hadron asymmetries in semi-inclusive deep   inelastic scattering off unpolarised nucleons
  Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three azimuthal modulations $\cos\phi_h$, $\cos2\phi_h$ and $\sin\phi_h$ were obtained binning the data separately in each of the relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ and binning in a three-dimensional grid of these three variables. The amplitudes of the $\cos \phi_h$ and $\cos 2\phi_h$ modulations show strong kinematic dependencies both for positive and negative hadrons. 
C. Adolph, R. Akhunzyanov, M.G. Alekseev, Yu. Alexandrov, G.D.   Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesil...
hep-ex