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

Abstract

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 $\cos {\varphi }_h$, $\cos 2{\varphi }_h$ and $\sin {\varphi }_h$ 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 $\cos {\varphi }_h$ and $\cos 2{\varphi }_h$ modulations show strong kinematic dependencies both for positive and negative hadrons.

33 pages, 15 figures and 10 pages

References in corpus (3)

• The COMPASS Experiment at CERN
• Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes
• A systematic phenomenological study of the $\cos 2\varphi$ asymmetry in unpolarized semi--inclusive DIS

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