F. Eisele

A search for νμ oscillations in the Δm2 range 0.3–90 eV2

Abstract We have searched for ν μ oscillations by comparing the rates of ν gm charged-current interactions in two detectors located 130 and 885 m from the target, which was struck by a 9.2 GeV/ c proton beam from the CERN Proton Synchroton. No evidence for ν μ oscillations was found. At the 90% confidence level, Δm 2 values between 0.26 and 90 eV 2 are excluded for maximal mixing. The most restrictive limit on the neutrino mixing-angle parameter sin 2 2 θ is 0.053 at Δm 2 =2.5 eV 2 .

Elastic Σ±p scattering at low energies

Abstract Total and differential elastic Σ ± p scattering cross sections have been measured in the momentum interval of 130–180 MeV/ c . From the Σ ± p total cross section allowed regions for the singlet and triplet scattering lengths are derived, applying the effective range approximation.

QCD analysis of charged-current structure functions

Abstract The structure functions F 2 ( x , Q 2 ) and xF 3 ( x , Q 2 ) measured in high-energy neutrino charged-current interactions on nuclei are compared with QCD predictions. Solutions to the moment equations of QCD are found which are in good agreement with the data and yield simple parametrisations of the structure functions. For the scale parameter Λ we find Λ = 0.5 ± 0.2 GeV. The analysis also results in values for the width of the gluon distribution as a function of Q 2 . We find 〈 x 〉 gluons = 0.16 ± 0.03 for Q 2 = 10 GeV 2 .

A new determination of the Ko → π+π− decay parameters

Abstract In a short neutral beam we have measured the proper time-dependence of the decay K o → π + π − . This time structure exhibits the interference between the short- and long-lived states and is in agreement with the general expectations of the CP violation phenomenology. This experiment gives new and more precise measurements of the following three parameters: 1. i) the decay width of the short-lived K S component: Γ S = (1.119±0.006) × 10 10 sec −1 ; 2. ii) the modulus of the CP violating parameter η +- : | η +- | = (2.30±0.035) × 10 −3 ; 3. iii) the phase of η +- as a function of the K S −K L mass difference Δm : φ +- = (49.4±1.0) o + [( Δm −0.540)/0.540] × 305 o The result of |η +- | may be compared with the result of the foregoing letter on Re ϵ in the frame of the superweak model. Good agreement is observed.

Fit of the parameters for Cabibbo's theory

AbstractAll experimental data on leptonic decays of Baryons available after the Kiev Conference on High Energy Physics (Sept. 1970) are used to fit the parameters of the Cabibbo theory. Especially new results on σ− and Λ leptonic decays and the values of the Σ± lifetime are included.The data are consistent with the one angle Cabibbo theory. The results for the three parameters are:

Measurement of the kaon mass difference mL-mS by the two regenerator method

\begin{gathered} \theta = 0.239 \pm 0.005 \hfill \\ g_1^F = 0.451 \pm 0.019 \hfill \\ g_1^D = 0.777 \pm 0.021. \hfill \\ \end{gathered}

Measurement of the electromagnetic interaction of the neutral kaon

Abstract The change asymmetry in semi-leptonic kaon decays has been measured as a function of the kaon lifetime. High statistics data of K e3 0 and K μ3 0 decay modes agree with each other and with the general expectation of the CP violation phenomenology together with the ΔS − ΔQ rule. The K L -K S mass difference obtained is Δm = (0.533 ± 0.004) × 10 10 s −1 .