The Beyond the standard model working group: Summary report

In this working group we have investigated a number of aspects of searches for new physics beyond the Standard Model (SM) at the running or planned TeV-scale colliders. For the most part, we have considered hadron colliders, as they will define particle physics at the energy frontier for the next ten years at least. The variety of models for Beyond the Standard Model (BSM) physics has grown immensely. It is clear that only future experiments can provide the needed direction to clarify the correct theory. Thus, our focus has been on exploring the extent to which hadron colliders can discover and study BSM physics in various models. We have placed special emphasis on scenarios in which the new signal might be difficult to find or of a very unexpected nature. For example, in the context of supersymmetry (SUSY), we have considered: how to make fully precise predictions for the Higgs bosons as well as the superparticles of the Minimal Supersymmetric Standard Model (MSSM) (parts III and IV); MSSM scenarios in which most or all SUSY particles have rather large masses (parts V and VI); the ability to sort out the many parameters of the MSSM using a variety of signals and study channels (part VII); whether the no-lose theorem for MSSM Higgs discovery can be extended to the next-to-minimal Supersymmetric Standard Model (NMSSM) in which an additional singlet superfield is added to the minimal collection of superfields, potentially providing a natural explanation of the electroweak value of the parameter {micro} (part VIII); sorting out the effects of CP violation using Higgs plus squark associate production (part IX); the impact of lepton flavor violation of various kinds (part X); experimental possibilities for the gravitino and its sgoldstino partner (part XI); what the implications for SUSY would be if the NuTeV signal for di-muon events were interpreted as a sign of R-parity violation (part XII). Our other main focus was on the phenomenological implications of extra dimensions. There, we considered: constraints on Kaluza Klein (KK) excitations of the SM gauge bosons from existing data (part XIII) and the corresponding projected LHC reach (part XIV); techniques for discovering and studying the radion field which is generic in most extra-dimensional scenarios (part XV); the impact of mixing between the radion and the Higgs sector, a fully generic possibility in extra-dimensional models (part XVI); production rates and signatures of universal extra dimensions at hadron colliders (part XVII); black hole production at hadron colliders, which would lead to truly spectacular events (part XVIII). The above contributions represent a tremendous amount of work on the part of the individuals involved and represent the state of the art for many of the currently most important phenomenological research avenues. Of course, much more remains to be done. For example, one should continue to work on assessing the extent to which the discovery reach will be extended if one goes beyond the LHC to the super-high-luminosity LHC (SLHC) or to a very large hadron collider (VLHC) with {radical}s {approx} 40 TeV. Overall, we believe our work shows that the LHC and future hadronic colliders will play a pivotal role in the discovery and study of any kind of new physics beyond the Standard Model. They provide tremendous potential for incredibly exciting new discoveries