X iv : h ep - p h / 96 05 29 7 v 1 1 4 M ay 1 99 6 DO - TH 96 / 08 May 1996 Probing the Parton Densities of Virtual Photons at ep

ar X iv : h ep - p h / 96 05 28 2 v 1 1 1 M ay 1 99 6 TWO TOPICS IN PARTICLE - ANTIPARTICLE MIXING

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 - t h / 96 05 08 6 v 1 1 3 M ay 1 99 6 Curvature expansion for the background – induced gluodynamics string

Using cumulant expansion for an averaged Wilson loop we derive an action of the gluodynamics string in the form of a series in powers of the correlation length of the vacuum. In the lowest orders it contains the Nambu–Goto term and the rigidity term with the coupling constants computed from the bilocal correlator of gluonic fields. Some higher derivative corrections are calculated.

ar X iv : h ep - p h / 96 05 44 0 v 1 3 0 M ay 1 99 6 LTH 372 hep - ph / 9605440 The three - loop SSM β - functions

We present the supersymmetric standard model three-loop β-functions for gauge and Yukawa couplings and consider the effect of three-loop corrections on the standard running

ar X iv : h ep - p h / 96 05 24 2 v 1 7 M ay 1 99 6 Meson bound states in multiflavour massive Schwinger model ∗

The problem of meson bound states with N f massive fermions in two dimensional quantum electrodynamics is discussed. We speculate about the spectrum of the lightest particles by means of the effective semiclassical description. In particular, the systems of fundamental fermions with SU (2) and SU (3) flavour symmetries broken by massive terms are investigated.