Physics at TeV Colliders - La physique du TeV aux collisionneurs - Les Houches 2007

This Report documents the results of the Les Houches 2007 Workshop "Physics at TeV Colliders". The work has been conducted within three Working Groups. One dealt with loop corrections to multileg processes (NLM). Another one dealt with Standard Model handles and candles, and with Higgs boson production (SMH). A third one studied Physics beyond the Standard Model (BSM)

Neutralino dark matter with inert higgsinos and singlinos

We discuss neutralino dark matter arising from supersymmetric models with extra inert Higgsinos and singlinos, where inert means that their scalar partners do not get vacuum expectation values. As an example, we consider the extended neutralino sector of the E6SSM, which predicts three families of Higgs doublet pairs, plus three singlets, plus a Z', together with their fermionic superpartners. We show that the two families of inert doublet Higgsinos and singlinos predicted by this model provide an almost decoupled neutralino sector with a naturally light LSP which can account for the cold dark matter relic abundance independently of the rest of the model, providing that the ratio of the two usual Higgs doublets satisfies tan ? &lt; 2. <br/