Various extensions of the standard model of elementary particle interactions predict the
existence of new particles such as axions, or “exotic” properties of known particles such as …

The possibility of additional quarks and leptons beyond the three generations already
established is discussed. The make-up of this Report is (1) Introduction: the motivations for …

The recent groundbreaking discovery of nonzero neutrino masses and oscillations has put
the spotlight on massive neutrinos as one of the key windows on physics beyond the …

Once top quarks are found, because they are heavy they will allow many new tests of the
standard model (SM) and new probes of physics at the 100-GeV scale. In this paper we …

The latest nuclear reaction cross sections (including the most recent determinations of the
neutron lifetime) are used to recalculate the abundances of deuterium,^ 3^ He,^ 4^ He, and …

The OPAL detector at thc c* c storage ring I. EP is designed to providc prccisc mcasu
remonts of charged particles and of clcctromagnetic cncrgy over ncarly the full solid angle …

We describe the elastic scattering of weakly interacting dark matter particles from nuclei, with
laboratory detection in mind. We focus on the lightest neutralino (a neutral fermion predicted …

The precision of sin 2θ MS w (mz) extracted from LEP data (0.233±0.001) confirms the
prediction of minimal supersymmetric GUTs (0.235±0.004) within the errors of about 2 …

The relic abundance of a particle species that was once in thermal equilibrium in the
expanding Universe depends upon a competition between the annihilation rate of the …

We study the possible distortions of the evolution of the early universe caused by the
oscillations of a standard neutrino (ν c, ν μ or ν τ) into a light “sterile” neutrino state, a gauge …