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Universidad de Granada CAFPE

Seminario: Phenomenology of non-minimal composite Higgs models

Ponente: Maria Ramos, LIP, Minho

Lugar: Seminario del Dpto. Física Teórica y del Cosmos

Fecha: 06/02/2020

Hora (24h): 15:00

Resumen:
In most composite Higgs models, additional scalars besides the Higgs boson emerge at the electroweak scale which are protected from the hierarchy problem by symmetry. These new degrees of freedom can explain other puzzles in particle physics such as baryogenesis, flavour anomalies and dark matter. In this talk, I will discuss the SO(7) composite Higgs model. Depending on the breaking pattern of the global symmetry, I will show that we can address the problems discussed above. In particular, if a SM triplet emerges from the strongly-interacting sector, the nature of the electroweak phase transition is modified, providing the necessary conditions for the generation of the baryon asymmetry. If instead two light singlets arise, they can couple to heavy resonances of the new sector, namely flavour-violating vector bosons. This scenario triggers rare B-meson decays into six muons, which are potentially more constraining than bounds from meson mixing. Other symmetry realizations, providing larger masses and stabilizing one of the singlets, provide a dark matter candidate. In this context, I will discuss motivated setups where the latter is the heaviest particle in the spectrum, leading to novel signatures of dark matter. Overall, this study motivates new experimental searches at multiple facilites, including future colliders and astrophysical observatories.