ar X iv : h ep - p h / 92 10 23 5 v 1 1 4 O ct 1 99 2 Uncertainties in Coupling Constant Unification

ar X iv : h ep - p h / 95 03 21 4 v 1 2 M ar 1 99 5 The strong coupling , unification , and recent data

The prediction of the strong coupling assuming (supersymmetric) coupling constant unification is reexamined. We find, using the new electroweak data, αs(MZ) ≈ 0.129±0.010. The implications of the large αs value are discussed. The role played by the Z beauty width is stressed. It is also emphasized that high-energy (but not low-energy) corrections could significantly diminish the prediction. How...

ar X iv : h ep - p h / 99 10 34 5 v 1 1 4 O ct 1 99 9 Quark mass effects to σ ( e + e − →

ar X iv : h ep - p h / 92 11 23 8 v 1 1 1 N ov 1 99 2 Properties of perturbative multi - particle amplitudes in φ k and O ( N ) theories

ar X iv : h ep - p h / 96 10 47 3 v 1 2 4 O ct 1 99 6 Inclusive Production of tt̄ Pairs in Hadronic Collisions ∗

We summarize our calculation of the total cross section for top quark production at hadron colliders within the context of perturbative quantum chromodynamics, including resummation of the effects of initial-state soft gluon radiation to all orders in the strong coupling strength.

ar X iv : h ep - p h / 97 11 23 2 v 1 4 N ov 1 99 7 Unified Theories

The present status of Unified Theories is summarized with special emphasis on their possible experimental tests. Outline: i) Unification of couplings; ii) Where can a positive signal come from? iii) HERA anomaly and Unification; iv) Recent progress in model building; v) Flavour and Unification.