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Résumé |
Thanks to the Higgs boson's close connection with many unsolved problems of
Particle Physics, precision studies of Higgs properties constitute a crucial probe
of Beyond-the-Standard Model (BSM) Physics. Among these properties, the trilinear
Higgs coupling provides a unique opportunity to access the structure of the Higgs
sector, investigate the nature of the electroweak phase transition and the origin
of the baryon asymmetry of the Universe, and search for indirect signs of BSM
Physics.
I will show that the trilinear Higgs coupling can, in models with extended scalar
sectors, be significantly enhanced with respect to its SM prediction.
Consequently, the current experimental bounds on this coupling are already
sufficient to rule out significant parts of the BSM parameter space that would
otherwise be unconstrained by state-of-the-art theoretical and experimental
constraints.
Next, I will present the new public tool anyH3, which provides complete one-loop
predictions for the trilinear Higgs coupling in arbitrary renormalisable theories.
I will review the main features of anyH3 and present examples of new results
obtained with it, as well as ongoing developments. |
