In this paper we survey methods by which supersymmetry (or other new physics) could be
observed in experiments at present and future accelerators. We review some of the …

Two-component spinors are the basic ingredients for describing fermions in quantum field
theory in 3+ 1 spacetime dimensions. We develop and review the techniques of the two …

The Pythia program can be used to generate high-energy-physicsevents', ie sets of outgoing
particles produced in the interactions between two incoming particles. The objective is to …

Pythia version 6 represents a merger of the Pythia 5, Jetset 7 and SPythia programs, with
many improvements. It can be used to generate high-energy-physics 'events', ie sets of …

We present the new coherent exclusive exponentiation (CEEX), the older exclusive
exponentiation (EEX), and the semianalytical inclusive exponentiation (IEX) for the process …

We present techniques which enable one to calculate quickly the amplitudes for many
scattering processes in the high-energy limit. As an illustration of the method, these are …

A general method to calculate next-to-leading-order multijet cross sections is presented. The
emphasis is on how to isolate the soft and collinear divergences in multiparton matrix …

We formulate the helicity amplitudes for multiple bremsstrahlung processes in massless
gauge theories in terms of spinor inner-products. In the non-abelian case (QCD) we show …

For the six-gluon scattering process we give explicit and simple expressions for the
amplitude and its square. To achieve this we use an analogy with string theories to identify a …

Previously published and as yet unpublished QCD results obtained with the ALEPH detector
at LEP1 are presented. The unprecedented statistics allows detailed studies of both …