ar X iv : h ep - p h / 98 10 52 4 v 1 2 9 O ct 1 99 8 Early History of Gauge Theories

ar X iv : h ep - p h / 98 10 52 7 v 1 2 9 O ct 1 99 8 HIGHER - TWIST CONTRIBUTIONS IN EXCLUSIVE PROCESSES

Using the renormalon technique, we estimate higher-twist contributions in deeply virtual Compton scattering and in hard exclusive π 0 leptoproduction.

ar X iv : h ep - t h / 98 10 23 4 v 1 2 8 O ct 1 99 8 FUNCTIONAL APPROACH TO PHASE SPACE FORMULATION OF QUANTUM MECHANICS

We present BRST gauge fixing approach to quantum mechanics in phase space. The theory is obtained by ¯ h-deformation of the cohomological classical mechanics described by d = 1, N = 2 model. We use the extended phase space supplied by the path integral formulation with ¯ h-deformed symplectic structure.

ar X iv : h ep - t h / 98 10 03 9 v 1 6 O ct 1 99 8 Remarks on Nöther charges and black holes en - tropy

We criticize and generalize some properties of Nöther charges presented in a paper by V. Iyer and R. M. Wald and their application to entropy of black holes. The first law of black holes thermodynamics is proven for any gauge-natural field theory. As an application charged Kerr-Newman solutions are considered. As a further example we consider a (1 + 2) black hole solution. 1

ar X iv : h ep - p h / 98 10 33 5 v 1 1 3 O ct 1 99 8 Gamma - Ray Bursts and Dark Matter - a joint origin ?

ar X iv : h ep - p h / 98 10 32 6 v 1 1 2 O ct 1 99 8 Low tan β in the extended Minimal Gauge Mediated Model ∗

We consider the Minimal Gauge Mediated Model (MGMM) with either fundamental or antisymmetric messenger multiplets and study consequences of messenger-matter mixing. It is shown that constraints on relevant coupling constants and mixing parameters coming from the existing experimental limits on lepton flavor violation and FCNC processes allow a wide range of tan β in MGMM with mixing.