Speaker
Description
Investigation of GPDs and TMDs represents one of the major goals of the COMPASS-II program. Together, GPDs and TMDs provide the most complete description of the partonic structure of a nucleon. GPDs can be accessed by lepton-induced exclusive scattering processes, such as Deep Virtual Compton Scattering or Hard Exclusive Meson Production. The exclusive $\pi^{0}$ production is the main source of background for the DVCS, and it provides complementary information on GPD parametrization. The dedicated GPD program started with a pilot run in 2012, followed by data taking in 2016-2017, using 160 GeV/$c$ muon beam and a liquid hydrogen target, equipped by a recoil proton detector. We will present the first measurement from 2012 of the exclusive $\pi^{0}$ cross section and its $\phi$ and $|t|$-dependence in the $x_B$ domain from 0.01 to 0.15. These results will be compared with the phenomenological Goloskokov-Kroll model. Prospect will be given on upcoming results of the 2016-17 measurement.
