News and Announcements

• Christophe Grojean (T (Theorie))

Room: SemRm 2

Composite WIMPs: theory and collider phenomenology

• Dario Buttazzo (INFN Pisa)

Room: SemRm 2 Weakly Interacting Massive Particles (WIMPs) are a well motivated Dark Matter candidate, with crucial connections to TeV scale physics. I will first review the general phenomenology of such candidates, discussing the computation of the relic abundance via freeze-out of their electroweak interactions, including non-relativistic effects like Sommerfeld enhancement and bound-state formation. For generic SU(2) multiplets, masses of several (tens of) TeV are predicted. The lightest WIMP candidates, in the few TeV range, can be discovered at future high-energy lepton or hadron colliders, with interesting signatures in various different channels. The heavier states can be detected with future large-exposure liquid Xenon experiments, and can be tested indirectly via their effects in electroweak physics, and with future gamma-ray telescopes. I will then discuss how such electroweak states can be embedded in models of a composite Higgs boson, thus connecting TeV-scale WIMPs with the electroweak hierarchy problem. I will show how the global symmetries of composite Higgs models can lead to accidental stability of the composite dark matter candidates. Interactions with the composite Higgs lead to a modified phenomenology, modifying the dark matter annihilation cross-section, and inducing scattering processes relevant for direct detection. The multi-TeV dark matter masses predicted by thermal freeze-out have important implications for the collider phenomenology of these models.