Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160Â GeV/c and a 6 LiD target. The amplitudes of the three azimuthal modulations cosâ¡Ïh , cosâ¡2Ïh and sinâ¡Ïh were obtained binning the data separately in each of the relevant kinematic variables x , z or pTh and binning in a three-dimensional grid of these three variables. The amplitudes of the cosâ¡Ïh and cosâ¡2Ïh modulations show strong kinematic dependencies both for positive and negative hadrons.

Germany

JINR

Italy

Russia

France

CERN

Poland

Czechia

Portugal

India

Japan

Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons