ar X iv : h ep - p h / 95 12 25 1 v 1 7 D ec 1 99 5 The Effects of a Vector - like Doublet as The Fourth Generation to R b

ar X iv : h ep - p h / 95 12 34 7 v 2 2 2 D ec 1 99 5 Correlation between Instantons and QCD - monopoles in the Abelian Gauge

ar X iv : h ep - p h / 97 12 41 5 v 1 1 7 D ec 1 99 7 The ALLM parameterization of σ tot ( γ ∗ p ) an update

ar X iv : h ep - p h / 96 12 38 7 v 1 1 7 D ec 1 99 6 The B → X s γγ rare decay

The rare decay B → Xsγγ is studied in the Standard Model (SM) and in two different versions (Model I and Model II) of the Two Higgs Doublet Model (2HDM). In the SM the branching ratio into hard photons is about 1 × 10 and can be appreciably different in the 2HDM. We also introduce a forward-backward asymmetry which gives an additional handle to discriminate different models.

ar X iv : h ep - p h / 99 12 28 8 v 2 1 5 D ec 1 99 9 Lattice Calculations and Hadron Physics

ar X iv : h ep - p h / 96 12 38 3 v 1 1 7 D ec 1 99 6 The Effective Lagrangian of the Two Higgs Doublet Model

We consider the two Higgs doublet model extension of the Standard Model in the limit where all physical scalar particles are very heavy; too heavy, in fact, to be experimentally produced in forthcoming experiments. The symmetry breaking sector can thus be described by an effective chiral Lagrangian. We obtain the values of the coefficients of the O(p 4) operators relevant to the oblique correct...