Mixing of a heavy neutrino with the electron neutrino.
We show that recent monojet searches in electron-positron annihilation experiments can be used to extend significantly the limits on the mixing of a massive fourth-generation neutrino with the electron neutrino. When combined with other limits from hadron decays and secondary-vertex searches in hadron and electron-positron annihilation experiments, bounds of Vertical BarU/sub 14/Vertical Bar/sup 2/< or approx. =10/sup -6/ for neutrino masses of 10 MeV/c/sup 2/ to over 10 GeV/c/sup 2/ are obtainable by analysis of existing data.

title: TOP DECAYS WHEN m (t) approximates M (W) + m (b)

title: CP violation in K decays
abstract: As in the case for much of contemporary research in high energy physics, the area of CP (the product of charge conjugation and parity) violation in K decays is to be seen in the context of a much broader effort of looking for physics beyond the Standard Model. One of the specific types of such physics is represented by the possibility of a fourth family, as exemplified by the title and main focus of this conference. From the broader perspective of looking for new physics of any kind, there are two principal avenues:

title: Symmetry Predictions from Sum Rules without Saturation
abstract: The application of sum rules derived from current commutation relations to give $\mathrm{SU}(6)$-like results is developed without the assumption of saturation. We first derive a consistency condition by comparing sum rules, and then study the sum rules for $\frac{1}{g_{A}^{}{}_{}{}^{2}}$ and the isovector charge radii, replacing the assumption of saturation with a simple dynamical model for the remaining continuuum contribution. This results in several $\mathrm{SU}(6)$-like predictions which contain important correction factors to the results previously derived assuming saturation. We have also re-examined the experimental data for the sum rule for $\frac{{〈r_{N}^{}{}_{}{}^{2}〉}^{V}}{6}$, and find that it converges below 1 GeV like the sum rule for $\frac{1}{g_{A}^{}{}_{}{}^{2}}$ when account is taken of the contribution to the sum rule of the large resonant ${M}_{1+}$ and nonresonant ${\mathrm{E}}_{0+}$ multipoles in pion photoproduction, and of the ${N}^{**}(1520)$.

title: ALGEBRAIC PROPERTIES OF ELECTROMAGNETIC AND WEAK CURRENTS AND THEIR REPRESENTATION ON HADRON STATES

title: The physics of heavy flavors
abstract: Various aspects of the physics of heavy flavors and of CP violation are reviewed. 102 refs., 21 figs.

title: M4 transitions observed in pion inelastic scattering on 15N.
abstract: Cross sections for ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ elastic and inelastic scattering to states in $^{15}\mathrm{N}$ have been measured at an incident pion energy of 164 MeV. Transitions to states at 10.7, 12.5, 14.0, and 17.2 MeV were found to contain significant M4 strength. The M4 assignments are supported both by angular distribution shapes and by additional ${\ensuremath{\pi}}^{+}$ cross sections measured at 120 and 260 MeV. The angular distributions are compared with distorted-wave impulse-approximation calculations to extract isoscalar and isovector spectroscopic amplitudes. These amplitudes are compared with model predictions.

title: Neutron and proton matrix elements for 21+ transitions in T=1 nuclei from pion inelastic scattering.
abstract: Cross sections have been measured for ..pi../sup +/ and ..pi../sup -/ inelastic scattering to the 2/sub 1//sup +/ levels of /sup 18/O, /sup 22/Ne, /sup 26/Mg, /sup 30/Si, and /sup 34/S. The data are used to infer neutron and proton quadrupole-matrix elements for these transitions. The matrix elements extracted from the pion data are in good agreement with their corresponding electromagnetic matrix elements. These results indicate that the use of the distorted-wave impulse-approximation is a valid procedure for this class of transition.

title: Forward-angle charged-pion electroproduction in the deuteron.
abstract: A direct experimental determination has been made of the ratio of the forward-angle positive-pion electroproduction cross section for a proton bound in the deuteron with that of a free proton for invariant masses of 1160 and 1232 MeV. A significant quenching of the reaction in the deuteron is observed.

title: Nuclear-structure aspects of nonanalog pion double charge exchange.
abstract: The sensitivity of pion double charge exchange to nuclear structure in the shell model is examined. We consider the nonanalog ground-state to ground-state (T = 0 to T = 2) transitions on a variety of nuclear targets. The reaction model, which assumes that double charge exchange is driven by a ..pi..+rho-meson--mediated, ..delta../sub 33/-nucleon interaction, reproduces the energy dependence and shape of the empirical cross section for all the (..pi../sup +/,..pi../sup -/) transitions examined. The magnitude of the cross section is particularly sensitive to collectivity in the nuclear wave functions. All parameters of the model, with the exception of the range of the meson-..delta../sub 33/ form factor, are fixed by theoretical arguments. The form factor is then determined by normalizing to the /sup 16/O(..pi../sup +/,..pi../sup -/) /sup 16/ Ne cross section. Predictions are made for a variety of other low-lying 0/sup +/ transitions.

title: Neutron and proton matrix elements for transitions in 39K from pion inelastic scattering.