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Annihilation of $\bar p+p\to e^++e^-+ \pi^0$ and $\bar p+p\to \gamma + \pi^0$ through $\omega$-meson intermediate state
E. A. Kuraev, Yu. M. Bystritskiy, V. V. Bytev, A. Dbeyssi1, E. Tomasi-Gustafsson1
(2012)

The s-channel annihilation of proton and antiproton into a neutral pion and a real or virtual photon followed by lepton pair emission is studied. Such mechanism is expected to play a role at moderate values of the total energy $\sqrt{s}$, when the pion is emitted around $90^{\circ}$ in the center of mass. A fair comparison with the existing data is obtained taking into account scattering and annihilation channels. The cross section is calculated and numerical results are given in the kinematical range accessible in the PANDA experiment at FAIR.
1:  IPNO - Institut de Physique Nucléaire d'Orsay
Physics/High Energy Physics - Phenomenology

Physics/Nuclear Theory
Fulltext link: 
http://fr.arXiv.org/abs/1012.5720