The $\sin (2\varphi )$ azimuthal asymmetry in exclusive ${\pi }^0$ production

Chentao Tan, Zhun Lu

The $\sin (2\varphi )$ azimuthal angular correlation between the transverse momenta of the scattered electron and the recoil proton in the $ep\to e^{\prime }{p}^{\prime }{\pi }^0$ process provides a…