Time-like observables: differential cross section and angular asymmetry

Dominique Marchand (1) , Thierry Hennino (1) , Ronald Kunne (1) , Saro Ong (1) , Béatrice Ramstein (1) , Malgorzata Sudol (1) , Egle Tomasi-Gustafsson (1, 2)

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 DPHN - Département de Physique Nucléaire (ex SPhN)

Time-like electromagnetic form factors can be obtained from unpolarized measurements of the differential cross section in proton antiproton annihilation in a pair of leptons, as $\overline{p}$ + p ↔ e+ + e− , with the PANDA detector at FAIR. We study the sensitivity of such measurements and focus on observables such as the angular asymmetry and the ratio of electric to magnetic form factors. We also collect useful formulas and references for future simulations and studies.

Mots clés: form factors; time-like; nucleon

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Dominique Marchand, Thierry Hennino, Ronald Kunne, Saro Ong, Béatrice Ramstein, et al.. Time-like observables: differential cross section and angular asymmetry. 2008, pp.36. ⟨in2p3-00374971v2⟩