Aim and Format of the Workshop
 
This Workshop is the fifth in a series whose aim is  to bring together theorists and experimentalists working on the phenomenology of the upcoming TeV colliders . The emphasis will be on the  physics at the LHC  with a particular attention on the hand on the progress in  new techniques  for the simulation of  Standard Model processes and on the other on the latest developments concerning new mechanisms of symmetry breaking and the New Physics.  
Themes to be covered in the Workshop range from Quantum ChromoDynamics to  the mechanism of Electroweak Symmetry Breaking , notably Higgs physics , Supersymmetry, the phenomenology of Extra-dimensions and Little Higgs models. The Dark Matter  connection between cosmology and astrophysics and collider physics will be addressed.  The interdependence between the signals from the New Physics and their respective backgrounds will be stressed. 
Three Working Groups have been set up covering these different aspects of the Physics at the LHC.  The first working group will address the issue of the theoretical predictions for multileg  processes, in particular beyond leading order,  and the possibility of implementing these calculations in Monte Carlos.  This working group aims at  a cross breeding between novel approaches (twistors, bootstraps,..) and improvements in standard techniques. The second working group will review and critically compare existing tools for SM processes, covering issues in pdf, jets and Higgs physics. The third group is a beyond SM group, subdivided into SUSY and new models of symmetry breaking. It will also address the issue of model reconstruction and model independent searches based on topologies. As usual within the Les Houches PhysTeV series we expect a strong interplay and collaboration between these different groups and subgroups.  
The projects are to start in January 2007 and should be completed by the end of the year 2007.

The meeting at les Houches, between June 4th and June 22nd 2007 , will be the central point of the Workshop where, besides the Working Group activities, a few lectures and review talks are planned. Participation to the Workshop is open to all however due to space limitation in Les Houches, attendance to the meeting is limited to 70 participants at any given point. Due to the overwhelming response of the past three sessions,  this session is over a period of  almost 3 weeks. Though we expect some participants to attend the full duration of the meeting, plans will be made so that a certain number of participants cover either the first of second half of the meeting, allowing us to accommodate about 110-120 participants in total this time. 

Les Houches Centre for Physics is located in the French Alps, about an hour from Geneva and an hour from Annecy. The Centre has a tradition of organising Schools, Workshops and Conferences for more than five decades now and boasts an excellent library. For the purpose of this Workshop a special computing system will be installed.