ar X iv : h ep - p h / 97 05 46 8 v 1 3 0 M ay 1 99 7 A Note on CP Invariance and Rephasing Invariance 1

ar X iv : h ep - p h / 96 05 34 7 v 1 1 7 M ay 1 99 6 Neutrinos and Electromagnetic Gauge Invariance

It is discussed a recently proposed connection among U(1) em electromagnetic gauge invariance and the nature of the neutrino mass terms in the framework

ar X iv : h ep - p h / 97 05 45 5 v 1 2 8 M ay 1 99 7 LECTURE 1 Spectral Fluctuations of the QCD Dirac Operator

ar X iv : h ep - t h / 97 05 21 6 v 1 2 8 M ay 1 99 7 On Gauge Invariance and Spontaneous Symmetry Breaking ∗

We show how the widely used concept of spontaneous symmetry breaking can be explained in causal perturbation theory by introducing a perturbative version of quantum gauge invariance. Perturbative gauge invariance, formulated exclusively by means of asymp-totic fields, is discussed for the simple example of Abelian U (1) gauge theory (Abelian Higgs model). Our findings are relevant for the elect...

ar X iv : h ep - t h / 98 05 20 4 v 1 2 8 M ay 1 99 8 Derivative expansion and large gauge invariance at finite temperature

We study the 0+1 dimensional Chern-Simons theory at finite temperature within the framework of derivative expansion. We obtain various interesting relations, solve the theory within this framework and argue that the derivative expansion is not a suitable formalism for a study of the question of large gauge invariance.

ar X iv : h ep - p h / 97 05 23 6 v 2 8 M ay 1 99 7 OITS - 630 Contact Interaction

We reexamine the contact interaction hypothesis for excess high-Q events seen at HERA in ep → eX scattering. We consider the most general structure of contact interactions insisting on SU(3)C×SU(2)L×U(1)Y invariance. Apart from constraints for ee → qq̄ , Drell-Yan and atomic parity violation experiments, we find stringent constraints from neutrino deep inelastic data, provided one assumes lepton...