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SUMMARY:Higgs and Flavour Portals to the Dark Sector - Jernej Kamenik
DTSTART:20140221T160000Z
DTEND:20140221T170000Z
UID:TALK49933@talks.cam.ac.uk
CONTACT:Damien George
DESCRIPTION:Despite the great phenomenological successes of the Standard M
 odel (SM)\, the question whether the SM particles are the only dynamical d
 egrees of freedom within the electroweak energy range is far from establis
 hed. In fact\, there are now very strong indications that the universe is 
 filled with dark matter (DM)\, so there should be at least one new electri
 cally neutral colorless particle\, possibly lighter than the electroweak s
 cale. With this in mind\, we construct the most general basis of operators
  parametrizing a low-scale departure from the SM particle content. As an e
 xample application\, the resulting set of operators is used to systematica
 lly investigate the discovery potential of rare Flavour Changing Neutral C
 urrent (FCNC) decays of the K and B mesons with missing energy in the fina
 l state. In similar vein we also demonstrate that the discovery channel fo
 r DM production at colliders could be through flavour violating interactio
 ns resulting in a novel "monotop" signature of a single top and large miss
 ing transverse energy. We finally investigate the impact of hypothetical n
 ew neutral light particles on the tiny width of a light Higgs boson. Revie
 wing the possible signatures in the Higgs decay modes with missing energy\
 , in many cases simply preventing these modes from being dominant suffices
  to set tight model-independent constraints on the masses and couplings of
  the new light states. We then apply this analysis to Higgs portal models 
 of DM\, where DM is light enough to contribute to invisible Higgs decays. 
 We show that DM can be a thermal relic only if there are additional light 
 particles present with masses below a few 100 GeV.
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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