The work contained herein constitutes a report of the "Beyond the Standard Model" working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 26 May-6 June, 2003. The research presented is original, and was performed specifically for the workshop. Tools for calculations in the minimal supersymmetric standard model are presented, including a comparison of the dark matter relic density predicted by public codes. Reconstruction of supersymmetric particle masses at the LHC and a future linear collider facility is examined. Less orthodox supersymmetric signals such as non-pointing photons and Rparity violating signals are studied. Features of extra dimensional models are examined next, including measurement strategies for radions and Higgs', as well as the virtual effects of Kaluza Klein modes of gluons. An LHC search strategy for a heavy top found in many little Higgs model is presented and finally, there is an update on LHC Z ′ studies. XIV Radion Mixing Effects In The Two-Higgs-DoubletModel 74 XV Search For The Radion Decay φ → hh With γγ+bb, τ τ +bb And bb+bb Final States In CMS 80 XVI The Invisible Higgs Decay Width In The ADD Model At The LHC 86 XVII Determining the extra-dimensional location of the Higgs boson 92 XVIII The sensitivity of the LHC for TeV scale dimensions in dijet production 95 XIX Little Higgs Model: LHC Potential 99 XX Z ′ studies at the LHC: an update 104 5 Part I Abstract An accord specifying a unique set of conventions for supersymmetric extensions of the Standard Model together with generic file structures for (1) supersymmetric model specifications and input parameters, (2) electroweak scale supersymmetric mass and coupling spectra, and (3) decay tables is defined, to provide a universal interface between spectrum calculation programs, decay packages, and high energy physics event generators. AbstractWe present and describe an internet resource which allows the user to compare different calculations of MSSM spectra. After providing (currently mSUGRA) SUSY breaking input parameters, the spectra predicted by the publicly available programs ISASUGRA, SOFTSUSY, SPHENO and SUSPECT are output by the resource. The variance and range of results is also produced. AbstractWe compare the relic density of neutralino dark matter within the minimal supergravity model (mSUGRA) using four different public codes for supersymetric spectra evaluation.Abstract SFITTER is a new tool to determine supersymmetric model parameters from collider measurements. It allows to perform a grid search for the minimal χ 2 and/or a fit of a given model. Currently, the model parameters in the general MSSM or in a gravity mediated SUSY breaking model can be tested using a given set of mass, branching ratio and cross section measurements. AbstractWe present the Fortran code SDECAY, a program which calculates the decay widths and branching ratios of all supersymmetric particles in the Minimal Supersymmetric Standard Model, including higher order effects. The usual two-body decays of sfermions and gauginos as ...

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The key concepts of gauge invariance and spontaneous symmetry breaking that helped build the Standard Model of particle physics are introduced. A short description of radiative corrections that have made the model pass all precision tests, in particular those from LEP, is presented.

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