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Abstract: Contrary to the reaction pbar + p -> e+ e- with a high momentum incidentantiproton on a free target proton at rest, in which the invariant mass M ofthe e+ e- pair is necessarily much larger than the pbar p mass, in thereaction pbar + d -> n e+ e- the value of M can take values near or below thepbar p mass. In the antiproton-deuteron electromagnetic annihilation, thisallows to access the proton electromagnetic form factors in the time-likeregion of q^2 near the pbar p threshold. We estimate the cross sectiondsigmapbar +d -> e+ e- n-dM for an antiproton beam momentum of 1.5 GeV-c. Wefind that near the pbar p threshold this cross section is about 1 pb-MeV. Thecase of heavy nuclei target is also discussed. Elements of experimentalfeasibility are presented for the process pbar + d -> n e+ e- in the contextof the Panda project.



Author: H.Fonvieille LPC-Clermont-Fd, France, V.Karmanov Lebedev Physical Institute, Moscow, Russia

Source: https://arxiv.org/







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