New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.
Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons
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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 $\cos\phi_h$, $\cos2\phi_h$ 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.
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COMPASS extracts cos φ_h, cos 2φ_h and sin φ_h azimuthal asymmetries from 2016-2017 muon-hydrogen SIDIS data and reports qualitative agreement with prior isoscalar-target results after a new diffractive vector-meson background subtraction.
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Measurements of transverse-momentum dependent effects in semi-inclusive DIS at COMPASS
New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.
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Azimuthal Asymmetries in Unpolarised Semi-Inclusive DIS at COMPASS
COMPASS extracts cos φ_h, cos 2φ_h and sin φ_h azimuthal asymmetries from 2016-2017 muon-hydrogen SIDIS data and reports qualitative agreement with prior isoscalar-target results after a new diffractive vector-meson background subtraction.