Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2020

Sigma-assisted low scale composite Goldstone–Higgs

Résumé

We show that the presence of a lightish scalar resonance, $\sigma $, that mixes with the composite Goldstone–Higgs boson can relax the typical bounds found in this class of models. This mechanism, inbred in models with a walking dynamics above the condensation scale, allows for a low compositeness scale $f \gtrsim 400$ GeV, corresponding to a misalignment angle $s_\theta \lesssim 0.6$, contrary to the common lore of a smaller angle. According to recent lattice results, the light $\sigma $ emerges thanks to a near-conformal phase above the condensation scale, consistent to the requirements from flavour physics. We study this effect in a general way, showing that it appears in all cosets emerging from an underlying gauge-fermion dynamics, in the presence of top partial compositeness. The scenario is testable both on the Lattice and experimentally, as it requires the presence of a second broad Higgs-like resonance, below 1 TeV, that can be revealed at the LHC in the ZZ and $t\bar{t}$ channels.

Dates et versions

hal-01897260 , version 1 (17-10-2018)

Identifiants

Citer

Diogo Buarque Franzosi, Giacomo Cacciapaglia, Aldo Deandrea. Sigma-assisted low scale composite Goldstone–Higgs. European Physical Journal C: Particles and Fields, 2020, 80 (1), pp.28. ⟨10.1140/epjc/s10052-019-7572-z⟩. ⟨hal-01897260⟩
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