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Time-like observables: differential cross section and angular asymmetry
Dominique Marchand1, Thierry Hennino1, Ronald Kunne1, Saro Ong1, Béatrice Ramstein1, Malgorzata Sudol1, Egle Tomasi-Gustafsson1, 2

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  SPhN - Service de Physique Nucléaire
Physique/Physique Nucléaire Expérimentale
nucleon – form factors – time-like
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