Deep Inelastic Scattering with Tagged Initial State Radiation: Complete O(alpha) leptonic QED Corrections

In this paper we extend the calculation of the QED corrections to deep inelastic lepton-proton scattering with a tagged photon, taking into account the full corrections on the lepton side. Comparing to previous results that were obtained by considering only large logarithmic terms at leading and next-to-leading accuray, we find that the difference is in general quite small, however, it may be significant in the region of large $y$ and small $x$.Comment: 21 pages, LaTeX2e, 2 figures. Corrected typos in eqs. (10),(18

A Monte Carlo algorithm for Multiphoton Beamstrahlung in Monte Carlo event generators

We describe a simple algorithm that calculates the distributions of electrons and positrons under multiphoton beamstrahlung at a future linear collider. The evolution equation as given by Chen is solved by a Monte Carlo algorithm. Explicit multiple beamstrahlung photons are generated. We present first results from an implementation of beamstrahlung into the Monte Carlo event generator {\tt WOPPER}, that calculates the QED radiative corrections to the process $e^+e^- \to 4$~fermions through resonating W pairs.Comment: 9 pages, LaTeX, 2 figures, uses epsfig.st