Annihilation of $\bar p+p\to e^++e^-+ π^0$ and $\bar p+p\to γ+ π^0$ through $ω$-meson intermediate state

Details Annihilation of $\bar p+p\to e^++e^-+ π^0$ and $\bar p+p\to γ+ π^0$ through $ω$-meson intermediate state Annihilation of $\bar p+p\to e^++e^-+ π^0$ and $\bar p+p\to γ+ π^0$ through $ω$-meson intermediate state

2010-12-28

arxiv.org/abs/1012.5720v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

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.

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