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 $cosphi_h$, $cos2phi_h$ and $sinphi_h$ 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 $cos 2phi_h$ modulations show strong kinematic dependencies both for positive and negative hadrons.
Download