A study of the effect of molecular and aerosol conditions in the atmosphere on air fluorescence measurements at the Pierre Auger Observatory

Contains fulltext : 84338.pdf (preprint version ) (Open Access)21 p

"Playdoyer" for a charmonium spectroscopy at SuperLEAR

We think the construction of a new antiproton storage ring at CERN, with a momentum of circulating particles from 2 up to 7 GeV/c, would lead to an important progress in our understanding of strong interactions. As an example a quantitative charmonium spectroscopy and the search for "exotic" heavy states (c cbar g, cq - cbar qbar, gg) are discussed in the framework of the detection of the e+e- pairs (J/psi or psi' probe)

Proton electromagnetic form factors in the time like region from 8.9 to 13.0 GeV2

Cross sections for the reaction pp→e+e- have been measured at s=8.9, 12.4, and 13.0 GeV2. The cross sections have been analyzed to obtain the proton electromagnetic form factors in the timelike region

Production of the f2(1520) resonance in antiproton-proton annihilation at sqrt(s)=2980 and 3526 MeV

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Study of the angular distribution of the reaction p pbar -> chi c2 -> J/psi gamma -> e+ e- gamma

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J/psi pi0 and e+ e- exclusive production in proton-antiproton annihilation

We have measured the non resonant production cross section for the processes p pbar >> J/psi pizero and p pbar >> e+ e- at center of mass energies around 3.5 GeV. We found evidence for a resonance af mass 3525.2 and width <1.1 MeV that we identify with the state hc (1P1) of charmoniu