Azimuthal asymmetries of hadrons produced in unpolarized SIDIS at COMPASS

The asymmetry in the azimuthal angle distribution of hadrons produced in unpolarized Semi-Inclusive Deep Inelastic Scattering (SIDIS) carries information on the intrinsic transverse momentum of the quark ${overrightarrow{k}}_{T}$ and on the still unknown Boer-Mulders parton distribution function ${h}_{1}^{perp }$. Using the data collected in 2016 and 2017 with 160 GeV/c muon beams scattering off a liquid hydrogen target, the COMPASS Collaboration is measuring the azimuthal asymmetries ${A}_{UU}^{cos {phi }_{h}}$, ${A}_{UU}^{cos 2{phi }_{h}}$ and ${A}_{LU}^{sin {phi }_{h}}$ for charged hadrons. The preliminary results shown here confirm the strong kinematic dependencies observed in previous measurements conducted by COMPASS, HERMES and CLAS. The contribution from hadrons produced in the decay of vector mesons diffractively produced is also discussed.