Beam Spin Asymmetry for Deeply Virtual $pi^0$ Electroproduction with CLAS12.

Deeply virtual exclusive meson electroproduction is a powerful tool to study the internal structure of the nucleon as the process amplitude contains Generalized Parton Distributions (GPDs).

Among these reactions, the pseudoscalar meson reactions provide access to the chiral-odd GPDs which gives it a special place in the extensive program of exclusive measurements.

In this talk, we present the new experimental measurements of beam spin asymmetry performed for the deeply virtual exclusive $pi^0$ production in a wide kinematic region with photon virtualities $Q^2$ up to 8 GeV$^2$.

The data were collected by the CEBAF Large Acceptance Spectrometer (CLAS12) at Hall B, Jefferson Lab with a longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid hydrogen target.

Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions.

The interpretation of these measurements in terms of the GPDs demonstrates their sensitivity to the chiral-odd GPD $ar E_T$, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the proton's transverse anomalous magnetic moment.