[en] It is shown that neutrino mixing, of the type required for neutrino oscillations, will complicate efforts to determine the electron neutrino mass from β decay spectra. The shape of the spectra will depend on the masses and mixing angles of all neutrinos which couple to the electron neutrino

[en] It is not necessary that the electron neutrino and muon neutrino themselves have mass for oscillations to occur. For N neutrinos, if one is massive, oscillations occur with unique oscillation length determined by the mass of the heavy neutrino, mimicing two neutrino mixing. Any observation of oscillations cannot therefor be regarded as evidence for a finite mass electron neutrino or muon neutrino

[en] It is shown that the rho exchange isovector parity violating potential is constrained by PCAC to be much weaker than the π exchange potential, and much weaker than recently proposed by Galic, Gubernia, Picek and Tadic. This potential does not therefore provide a mechanism for suppressing enhanced neutral current effects in the π exchange potential

[en] A neutrino of mass greater than 1 MeV provides a simple explanation of the residual Goldberger-Treiman discrepancy. However this reduces the π → eν branching ratio below the classical V-A value, in contradiction with the present experimental observation

[en] It is shown that the smallness of the contribution of the isoscalar part of the parity violating rho exchange potential to the circular polarisation of the photon emitted in the reaction n + p → d + γ is a consequence of the low energy peak of the E1 excitation spectrum of the deuteron

[en] Heavy neutrinos have been recognised as providing a possible mechanism for muon number violating processes. Rates for these processes depend on neutrino mixing angles and masses. If the heavy neutrino mass is less than 400 MeV, the author shows that the present limit on muon neutrino - electron neutrino oscillations provides very stringent limits on the contribution of these processes to the rates for muon number violating processes

[en] The effect of QCD loop corrections to the weak interactions of hadrons is studied in a non-perturbative framework in which the matrix elements of the bare effective weak Hamiltonian between hadronic states are computed. The QCD renormalisation is carried out in the static cavity alleviating the scale matching problem of the standard short distance analysis. Specifically, the ΔI=1/2 rule was studied by computing the QCD corrected K-π matrix elements. The modified static cavity model used is characterised by four parameters; the effective quark-gluon coupling constant, the confinement pressure, the zero-point energy and a parameter governing the centre-of-mass corrections. These parameters are fitted to the π and ρ masses and the charge radii of π and K. Results are given for the ultra-relativistic (m_u=m_d=O) sector and for a region (m_u=m_d∼140 MeV) where the ΔI=1/2 rule is uniquely reproduced. 17 refs., 19 figs., tabs

[en] Quantum chromodynamic based analysis of the low energy electroweak properties of light pseudo-scalars is studied using an approximate bilocal bosonization technique. Particular attention is given to the problem of maintaining electroweak gauge invariance, and a bilocal Wilson-line technique is introduced to address this problem. The decay constants F_K and F_π and the π^± charge radius are discussed in detail. 29 refs., 9 figs

[en] The possibility to test CP invariance in the W⁺W^- production via photon fusion at NLC was studied. The predictions of the CP violation effects are made within two Higgs doublet extensions of the minimal standard model, where CP violation is introduced by a neutral Higgs exchange in s channel. The width effect in the Higgs propagator on the CP violation effects is discussed in detail. The CP violation effects can be measured in some parameter region of the extensions. 12 refs., 1 fig

[en] The authors extend the dispersion relation calculation of the πNN vertex function to include off shell terms in the πN scattering matrix. These off shell terms are constrained by the current algebra and PCAC results, and contribute to the NN>ππ s-wave. As such, they add to the kinematic off shell effects which Durso, Jackson and VerWest found in the p-wave terms. The off shell terms increase the calculated Goldberger-Treiman discrepancy from 0.02 to 0.03, bringing it into agreement with the field theory value of Jones and Scadron (0.035). The calculated discrepancy remains smaller than the experimental value of 0.06 +- 0.01