Overall Objectives
Our research approach is based on the twin concepts of discovery and precision physics, which taken together
provide a powerful tool for testing the StandardModel (SM) of fundamental interactions and uncovering evidence
for new physics. Very heavy new particles contribute only indirectly via quantum fluctuations and
thus subtly alter the size of measured parameters of the SM such as the relation between the weak boson
masses. Alternatively, at sufficiently high energies, the new particles and interactions can be observed directly,
generally in multi-particle final states. In both cases, the identification of physics beyond the SM
requires very precise predictions that can be measured in high-energy experiments, in particular at the Large
Hadron Collider (LHC) and the International Linear Collider (ILC). The progress has to proceed in two
directions. On the one hand, the theoretical precision of many observables must be improved by calculating
higher-order corrections, i.e. by evaluating Feynman diagrams with more loops. Secondly, precise calculations
are required for more complicated processes, i.e. for processes with more external particles. These are
needed both for the SM and for extensions thereof.
The objectives of the network can be classed into three areas. The first area deals with the development of
sophisticated tools for precise calculations of multi-leg and/or multi-loop processes. The second area encompasses
precision calculations for the LHC and the ILC that are performed with tools developed within
and outside our network. These calculations involve both strong and electroweak corrections and will be performed
in the SM but also in extensions thereof. The third area of objectives deals with discovery physics.,
i.e. methods needed to discover new phenomena and to determine the properties of new particles and interactions.
In this respect, our network will focus on questions related to electroweak symmetry breaking and
the origin of mass together with the (related) quest for more general symmetries such as supersymmetry.
 

Overall Approach and Methodology
The research methods employed by the network involve a combination of computer algebraic, analytical and
numerical tools and physical ideas spanning a very wide range of techniques and expertise.
The techniques of perturbative quantum field theory are essential. The available computational tools, such
as symbolic manipulation programs, and efficient numerical libraries will be employed as far as possible.
Dedicated packages for Feynman diagram calculations, Monte Carlo integration and event generation will
be used and further developed. Existing models for physics beyond the Standard Model will be phenomenologically
investigated, and possible signals for new physics at the LHC and the ILC will be studied within
specific models.
Scientific dialogue and collaboration is vital and will be implemented by electronic mail exchange, a network
webpage, secondments and the organization of regular meetings. The local training will be supplemented by
the network schools and the participation of the young researchers in various other schools and workshops.

The Coordinator