ar X iv : h ep - p h / 99 05 55 5 v 2 3 0 N ov 1 99 9 Photoproduction and electroproduction of charm at high energies

ar X iv : h ep - p h / 99 05 55 5 v 1 3 1 M ay 1 99 9 Photo - and electroproduction of charm at high energies

In the framework of model motivated by perturbative calculations in QCD we estimate the differential and total cross sections for both the photoproduction of vector D *-mesons and their yield in deep inelastic scattering at the HERA collider. The offered model allows us to take into account higher twists over the transverse momentum of meson at p T ∼ m c and correctly to approach the dominance ...

ar X iv : h ep - e x / 99 09 03 9 v 1 2 3 Se p 19 99 The Partonic Structure of the Quasi - Real Photon

New measurements of dijet photoproduction at HERA provide information on the gluon density in the photon and on its quark densities at high x γ and high factorisation scales.

ar X iv : h ep - p h / 95 10 31 0 v 3 2 N ov 1 99 5 Numerical Study of Induced False Vacuum Decay at High Energies

We calculate numerically the probability exp[ 1 λ F (E/E sph , N/N sph)] of the false vacuum decay in the massive four-dimensional −λφ 4 model from multipar-ticle initial states with fixed number of particles N and energy E greater than the height of the barrier E sph. We find that at E ∼ < 3E sph and N ∼ < 0.4N sph the decay is classically forbidden and thus is exponentially suppressed. We arg...

ar X iv : h ep - t h / 94 11 09 7 v 2 2 9 N ov 1 99 4 CURRENT DIRECTIONS IN STRING THEORY AND ABSTRACT SUPERSYMMETRY JEFFREY

I discuss some current thoughts on how low-energy measurements and consistency constrain theories at high energies with emphasis on string theory. I also discuss some recent work on the dynamics of supersymmetric gauge theories.

ar X iv : h ep - p h / 99 11 40 8 v 1 19 N ov 1 99 9 Quark Matter 99 Summary : Hadronic Signals