New possibility for further measurements of nucleon form factors at large momentum transfer in time-like region: $\bar{p}+p\to {\ell }^{+}+{\ell }^{-}$, $\ell =e$ or $\mu$

Abstract

We briefly summarize the status with electromagnetic nucleon form factors, and give in this framework, arguments to study the angular dependence of the differential cross section and single-spin polarization phenomena (polarized target or polarized beam) in $\bar{p}+p\to {\ell }^{+}+{\ell }^{-}$, in view of the availability of future antiproton beams.

Comments: 7 pages 1 table DAPNIA REPORT -04-10, 01/2004