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By a simple extension of the standard electroweak gauge group to SU L (2)× U e (1)× U μ (1)× U τ (1), it is shown that it is possible to get light-neutrino masses in the range of a few electron volts. For this purpose it is necessary that M R , the mass scale associated with the masses of...
If there are four generations of fermions, there may exist an additional, light, neutral gauge boson (Z ̃ 0 ). Constraints on the mass and mixing angle of Z ̃ 0 are obtained from neutral-current data and from high-energy pp¯ collider data. It is found that &≳160 GeV.
We apply the quaternionic quantum mechanics model for CP nonconservation, previously developed by Adler for K mesons, to heavy-flavor systems. We show that unlike superweak models, it can accommodate anomalously large D 0 -D¯ 0 mixing. On the other hand, in common with superweak models, the...
The transverse-momentum distribution of lepton pairs produced in ultrarelativistic nuclear collisions is analyzed in different scenarios for the phase transition from quarks and gluons to hadrons. A first-order phase transition at equilibrium is characterized by an intermediate phase where...
The recent measurement by the UA1 group of the cross section for bottom-quark production with transverse momentum greater than 5 GeV is found to be in good agreement with the simplest, lowest-order computations in perturbative quantum chromodynamics. This may be contrasted with the well-known...
We consider the impact of light (a few tens of MeV or less) scalar neutrinos on the rare decay K + → π + +invisible. We argue that such supersymmetric particles, if they exist, may be produced as copiously as ordinary neutrino pairs and that the contributions of the neutrino and...
When the nucleon is described as the self-consistent nontopological soliton ground state of a translation-invariant model Hamiltonian for a nonstatic baglike core interacting with a pion field, the motion of the core is shown to have a significant effect on the proton and neutron electric form...
The one-loop corrections to gaugino masses in superstring models are computed and are found to be nonzero.
Hypothetical fourth-generation quarks of charge -(1/3) and exotic quarks from E 6 theories can each form quarkonia bound states. Since both systems have identical strong and electromagnetic properties, the only hope of distinguishing these two quarkonia is to examine their weak interactions. In...
We examine contributions from the Δ (1232) to radiative capture (at rest) of a muon by a nucleon. This is motivated by the need for a thorough understanding of all contributing amplitudes in order to determine the pseudoscalar weak current and its coupling g P from experiments on radiative...
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