ar X iv : h ep - p h / 97 06 23 4 v 1 3 J un 1 99 7

ar X iv : h ep - p h / 96 06 23 3 v 1 4 J un 1 99 6 Precision Electroweak Constraints on Top - Color Assisted

Using precision electroweak data, we put limits on " natural " top-color assisted technicolor models. Generically the new U (1) gauge bosons in these models must have masses larger than roughly 2 TeV, although in certain (seemingly unrealistic) models the bound can be much lower.

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ar X iv : h ep - p h / 97 06 30 7 v 1 9 J un 1 99 7 UH - 511 - 872 - 97 WHAT IS SUPERSYMMETRY AND HOW DO WE FIND IT ?

In these Lectures, we present a pedagogical introduction to weak scale supersymmetry phenomenology. A basic understanding of the Standard Model and of the ideas behind Grand Unification, but no prior knowledge of supersymmetry, is assumed. Topics covered include: • What is supersymmetry and why do we bother with it? • Working with a supersymmetric theory: A toy example

ar X iv : h ep - p h / 95 06 25 9 v 1 7 J un 1 99 5 CERN – TH / 95 – 83 hep - ph / 9506259 May 1995 MULTIPLE HARD

ar X iv : h ep - p h / 97 06 29 1 v 1 9 J un 1 99 7 Quark Mass and Phase Transition for Strange Matter ⋆

We have derived the popularly used mass parametrization formula for light quarks and modified the corresponding formula for strange quarks with the mass-densitydependent model. A simple expression for the critical density of phase transition of strange quark matter at zero temperature is thus found and its value is estimated to be over 6 times the normal nuclear density.