ar X iv : h ep - p h / 99 07 47 7 v 1 2 3 Ju l 1 99 9 Dynamically broken Topcolor at Large - N ∗ †

ar X iv : h ep - p h / 94 07 39 7 v 1 2 9 Ju l 1 99 4 Analysis of the anomalous events e + e − → l + l −

ar X iv : h ep - p h / 99 07 30 0 v 1 1 2 Ju l 1 99 9 The hypothesis of a real Cabibbo

ar X iv : h ep - p h / 99 10 30 3 v 1 1 2 O ct 1 99 9 Topcolor - Assisted Supersymmetry

It has been known that the supersymmetric flavor changing neutral current problem can be avoided if the squarks take the following mass pattern, namely the first two generations with the same chirality are degenerate with masses around the weak scale, while the third generation is very heavy. We realize this scenario through the supersymmetric extension of a topcolor model with gauge mediated s...

ar X iv : h ep - p h / 99 07 47 1 v 1 2 3 Ju l 1 99 9 hep - ph / 9907471 July 1999 Problems of the Strategy of Regions

Problems that arise in the application of general prescriptions of the so-called strategy of regions for asymptotic expansions of Feynman in-tegrals in various limits of momenta and masses are discussed with the help of characteristic examples of two-loop diagrams. The strategy is also reformulated in the language of alpha parameters.

ar X iv : h ep - l at / 9 80 80 17 v 1 1 7 A ug 1 99 8 1 Chiral symmetry breaking , instantons and the ultimate quenched calculation

The reader is referred to [1,2] for background to this field. Preliminary results for this work have been given elsewhere [3]. The QCD Lagrangian for Nf quarks in the chiral limit possesses a large family SUL(Nf ) ⊗ SUR(Nf )⊗UB(1)⊗UA(1) of global symmetries. Phenomenologically we find that the non U(1) part of this symmetry is dynamically broken to the diagonal subgroup, SUL(Nf ) ⊗ SUR(Nf ) → S...