Measurements of Unpolarized Azimuthal Asymmetries at COMPASS
  Azimuthal Asymmetries in unpolarized SIDIS can be used to probe the transverse momentum of quarks inside the nucleon. Furthermore, they give access to the so-far unmeasured Boer-Mulders function. We report on the first measurement of azimuthal asymmetries of the SIDIS cross section from scattering of muons off a deuteron target. 
W. K\"afer (for the COMPASS collaboration)