The proton is an essential constituent of the visible matter that surround and compose us, but some of its fundamental properties are still not understood. In this seminar, I will focus on Semi-Inclusive Deep Inelastic Scattering (SIDIS) of electrons on an unpolarized target as a way to get information on the proton three dimensional structure in momentum space. I will briefly introduce the theoretical framework that leads to the definition of the Transverse Momentum Partonic Distribution functions (TMDs). I will then consider the processes : ep → eπ±,0X, and ep → eK±X that are being measured at CLAS12 ( Jlab, USA) in a wide kinematic range and with high statistic. An overview of the detector will be given with particular emphasis to its particle identification capability, reached thanks to an innovative Ring Imaging Cherenkov detector realized by the INFN.
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