Brian H. Smith

Summing one-loop graphs in a theory with broken symmetry

The method suggested by Brown for calculating multiparticle threshold amplitudes is extended to the one-loop level in scalar theories with broken reflection symmetry. A result for the threshold amplitude for multiparticle production is derived. It is also shown that the tree-level amplitude for two on-mass-shell particles producing [ital n] particles vanishes at the kinematical threshold for [ital n][gt]2.

e+ e− → τ+ τ− at the threshold and beyond

The excitation curve for the

Normalization of QCD corrections in top quark decay

\tau^+ \, \tau^-

Higher order QCD corrections tob→cc¯s

production in electron positron annihilation near the threshold is revisited with the aim of updating and extending a previous work. We find that the corrections of the relative magnitude

Normalization of QCD effects on O(mt2) electroweak corrections.

O(\alpha)

Effects of amplitude nullification in the standard model

near the threshold are significantly contributed by the radiative modification of the Coulomb interaction between the

Higher order QCD corrections to b{r_arrow}c{bar c}s

\tau

Normalization of QCD effects in electroweak corrections

leptons. The interpolation between the Coulomb effects at the threshold and the relativistic effects at higher energies is considered and the resulting formula is argued to have relative accuracy up to, but not including, terms of the order of

Normalization of QCD effects on {ital O}({ital m}{sub {ital t}}{sup 2}) electroweak corrections

\alpha^2

On normalization of QCD effects in O(m(t)**2) electroweak corrections

at any velocity of the