ar X iv : h ep - p h / 98 10 38 4 v 1 1 6 O ct 1 99 8 Hadronic interactions models beyond collider energies

ar X iv : h ep - p h / 98 12 39 9 v 1 1 6 D ec 1 99 8 1 The Tau Lepton : Particle Physics in a Nutshell

τ decays 5. Beyond the Standard Model 5.1 CP violation in hadronic τ decays 5.2 " Forbidden " decays.

ar X iv : h ep - p h / 97 10 24 9 v 1 6 O ct 1 99 7 HADRONIC PHYSICS FROM THE LATTICE

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 - e x / 99 10 01 8 v 1 1 1 O ct 1 99 9 PHOTOPRODUCTION AT LOW Q

The past year has seen a number of important developments in hard photoproduc-tion physics at the HERA collider. These are surveyed.

ar X iv : h ep - p h / 98 02 25 6 v 1 5 F eb 1 99 8 1 Electromagnetic Emission Rates and Spectral Sum Rules ∗

The electromagnetic emission rates at SPS energies satisfy spectral constraints in leading order in the pion and nucleon densities. These constraints follow from the strictures of broken chiral symmetry. We saturate these constraints using available data, leading to model independent emission rates from a hadronic gas. With a simple fire-ball scenario, only large nucleon densities may account f...