[en] Published in summary form only

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[en] Short communication

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[en] The branching ratio R=GAMMA(K⁺→e⁺γ)/GAMMA(K⁺→μ⁺γ) has been measured with an improved version of the apparatus described elsewhere. From 404 observed K⁺→e⁺γ decays, R=(2.51+-0.15)x10^-5 was obtained, to be compared with the value predicted for pure axialvector interaction and μ-e-universality, Rsub(theor)=2.57x10^-5. (Auth.)

[en] Partial branching ratios (K⁺→π⁰μ⁺γ)/(K⁺→π⁰e⁺γ) have been measured in six lepton momentum bins between 120 and 180 MeV/c. From these, six relations between the form factors slopes lambdasub(+) and lambda₀ have been derived. Using the world average value lambdasub(+) = 0.029 +- 0.003 and combining the six partial results on lambda₀, lambda₀ = 0.019 +- 0.010 is obtained. This value is in agreement with the Callan-Treiman relation and other predictions. Together with recent K⁰sub(l3) results, it supports the ΔI = 1/2 rule. The agreement of this result with the value of lambda₀ obtained from Ksub(μ3) Dalitz-plot studies supports muon-electron universality. (Auth.)

[en] The decay K⁺→e⁺γγ has been investigated. For the structure-dependent part with positive γ-helicity (SDsub(+)) the branching ratio GAMMA(SDsub(+))/GAMMA(Ksub(μ2)) = (2.33+-0.42) X 10^-5 is obtained from 51+-3 events observed in the kinematical region Esub(e) >= 235 MeV, Esub(γ)>48 MeV and thetasub(eγ)>140⁰. For the corresponding part with negative γ-helicity an upper limit GAMMA(SDsub(-))/GAMMA(SDsub(+))<11 (90% CL) is obtained from the sample of electrons with energies 220 MeV<=Esub(e)<230 MeV and with no γ in the backward direction. This upper limit implies that the ratio of structure-dependent axial vector and vector amplitudes lies outside the region -1.8< asub(K)/γsub(K)<-0.54. For the decay K⁺ →e⁺γγanti γ the limit GAMMA(K⁺→e⁺γγanti γ)/GAMMA(Ksub(e2))<3.8 (90% confidence level) was found. (Auth.)

[en] Recently derived data-to-data (DTD) relations have been applied to elastic and inelastic scattering of 800-MeV protons from ⁹⁰Zr and ⁹²Zr. Significant differences between the cross sections for the 2₁/sup ts+/ and 4₁/sup ts+/ states in the two nuclei suggest that DTD relations between elastic and inelastic cross sections are inadequate. Nevertheless, the DTD relation which predicts the analyzing power (A/sub y/) from the cross section for inelastic transitions yields excellent agreement with the data. The physical significance of the fitting parameters is discussed

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No abstract available