Annihilation of $\bar{p}+p\to e^{+}+e^{-}+{\pi }^0$ and $\bar{p}+p\to \gamma +{\pi }^0$ through $\omega$-meson intermediate state

Abstract

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.

22 pages, 9 figures- Given more details on the model- final version accepted for publication

References in corpus (11)

• Measurement of the gamma gamma* --> pi0 transition form factor
• QCD analysis of bar p N -> gamma* pi in the scaling limit
• Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions
• Effective Lagrangian Approach to pion photoproduction from the nucleon
• Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR
• Testing axial and electromagnetic nucleon form factors in time-like regions in the processes $\bar{p}+n\to {\pi }^{-}+{\ell }^{-}+{\ell }^{+}$ and $\bar{p}+p\to {\pi }^0+{\ell }^{-}+{\ell }^{+}$, $\ell =e$, $\mu$
• Two-component model for the axial form factor of the nucleon
• Production of $\omega {\pi }^0$ pair in electron-positron annihilation
• The process p + pbar --> gamma + pi^0 within the handbag approch
• Polarization effects in the reaction $e^{+}+e^{-}\to {\rho }^{+}+{\rho }^{-}$ and determination of the $\rho -$ meson form factors in the time--like region
• Cross section and polarization observables for the reaction $e^{+}+e^{-}\to a_1(1260)+\pi$

Cited by in corpus (3)

• Pauli form factor contributions to the inelastic proton bremsstrahlung and dark photon production
• Antiproton--proton annihilation into pion pairs within effective meson theory
• A study of the process $e^{+}+e^{-}\to e^{+}+e^{-}p\bar{p}$ by the two-photon mechanism $\gamma \gamma \to p\bar{p}$ at high energies