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[en] Motivated by the discrepancy between theoretical predictions and present experimental data for the branching ratio of π0 → e+e- we propose a measurement of the electromagnetic pion form factor through the two-photon process e+e- → e+e-π0. (Author)
[en] The Crystal Barrel experiment has been constructed and installed at the Low Energy Antiproton Ring (LEAR) at CERN. It has been fully operational since late 1989. In this talk, recent results of meson spectroscopy in bar pp annihilations are presented. The main emphasis is on all-neutral annihilations, the study of the strange quark content of the proton, and the investigation of the decay mode of η particles. A 2++ resonance decaying into π0π0 at a mass of 1515 ± 10 MeV, with a width of 120 ± 10 MeV, has been seen in a 3π0 final state. 14 refs., 18 figs
[en] It is shown that in supersymmetric models with a light photino the probability of the decay π0→gammagamma can have a magnitude which presents interest from the point of view of experiment, provided that there is sufficiently large mixing between left-handed and right-handed scalar quarks
[en] Presented are recent results of experiments on the SND detector. Data were collected on the VEPP-2000 and VEPP-2M colliders (Novosibirsk) in the c.m. energy region 0.3–2.0 GeV. Integrated luminusity used is 70 and 25 pb–1 respectively. Cross section of the processes is measured.