No abstract available

[en] If any neutrinos have mass the reaction π⁰→γanti γ is allowed. With the forthcoming generation of machines this could provide a practical means for finding limits on neutrino masses. (Auth.)

[en] The statistical system of π⁰, π⁺ and π^- mesons with zero total isospin is studied. For neutral pions there is the enhancement of the fluctuations, whereas for charged pions the isospin conservation suppresses fluctuations. The correlations between the numbers of charged and neutral pions are observed for finite systems.

[en] The width π⁰→γγ decay was calculated using pion wave function found by the method of sum sules of quantum chromodynamics. The result, which was previously obtained using anomaly in axial current, is reproduced

[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] Short communication

[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

No abstract available

[en] Short communication; 5 refs

[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