No abstract available

[en] In an optical spark chamber experiment a sample of 80 eta Dalitz decays (eta→e⁺e^-γ) have been obtained and the eta electromagnetic form factor has been measured to be F(X)=1.0 - (0.22+-0.45)X, where X=M²sub(ee)/M²sub(eta), and the branching ratio (eta→e⁺e^-γ)/eta→π⁺π^-π⁰)=(0.0082+-0.0020). (Auth.)

[en] A search has been made for the decay eta→π⁰e⁺e^- in an optical spark chamber experiment at the Rutherford Laboratory. The observations are consistent with no events being seen and give an upper limit. Rate (eta→π⁰e⁺e^-)/Rate (eta→ALL)<4.5x10^-5(90%C.L.). (author)

[en] The decay eta→π⁰e⁺e^- has been looked for in an optical spark chamber experiment at the Rutherford Laboratory. The observations are consistent with no events being seen and give an upper limit rate (eta→π⁰e⁺e^-)/rate (eta→all) <4.5 x 10^-5 (90%C.L.). (Auth.)

[en] In an optical spark chamber experiment a sample has been obtained of 80 eta Dalitz decays (eta→e⁺e^-γ) and the eta electromagnetic form factor has been measured to be F(X)=1.0-(0.22+-0.45)X, where X=Msub(ee)sup(2)/Msub(eta)sup(2), and the branching ratio (eta→e⁺e^-γ)/(eta→π⁺π^-π⁰)=(0.0082+-0.0020). (author)

No abstract available

[en] A method for measuring the photomultiplier gain using a realistic photomultiplier response function is described. A precision of about 1% for the de convoluted gain parameter can be achieved

No abstract available

No abstract available

[en] Data on the charge-exchange reaction π^-p → (π⁺π^-π⁰)n have been taken at beam momenta of 12 and 15 GeV/c, using the CERN Omega Multiparticle Spectrometer. A partial-wave analysis has been made of the (3π)⁰ system. Both natural and unnatural spin-parity production is observed. The natural parity states can be identified with established resonances. In addition a natural spin-parity enhancement is observed at a mass of about 2 GeV/c² with Jsup(P) = 4⁺ preferred. This effect is called the A₂*(2030). The unnatural spin-parity production found is consistent with reggeized Deck model predictions. No unambiguous A₁ or A₃ production is observed. (Auth.)