ar X iv : h ep - t h / 95 06 00 3 v 1 1 J un 1 99 5 UT - 707 , 1995 Analytic Index and Chiral Fermions †

ar X iv : h ep - t h / 95 06 05 1 v 1 8 J un 1 99 5 June 1995 TAUP – 2253

We show that instantons violate a supersymmetric identity in a classically supersymmetric Higgs model with no massless fermions. This anomalous breaking arises because the correct perturbative expansion in the instanton sector is not supersymmetric. The attempt to construct a manifestly supersymmetric expansion generates infra-red divergences.

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 / 95 06 25 0 v 1 6 J un 1 99 5 CERN - TH / 95 - 121 Jet Physics in Deeply Inelastic Scattering at HERA ∗

We give an overview of jet physics in deeply inelastic scattering at HERA. The problem of jet definitions, the scale dependence of jet cross sections and some applications are discussed.

ar X iv : h ep - t h / 99 06 02 9 v 1 3 J un 1 99 9

ar X iv : h ep - t h / 95 06 05 3 v 1 8 J un 1 99 5 STRINGS AND DISSIPATIVE MECHANICS

Noncritical strings in the " coupling constant " phase space and bosonic string in the affine-metric curved space are dissipative systems. But the quantum descriptions of the dissipative systems have well known ambiguities. We suggest some approach to solve the problems of this description. The generalized Poisson algebra for dissipative systems is considered.