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Search: authors:"Adrián Carmona"

5 papers found.
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Exceptional composite dark matter

We study the dark matter phenomenology of non-minimal composite Higgs models with SO(7) broken to the exceptional group \(G_2\). In addition to the Higgs, three pseudo-Nambu–Goldstone bosons arise, one of which is electrically neutral. A parity symmetry is enough to ensure this resonance is stable. In fact, if the breaking of the Goldstone symmetry is driven by the fermion sector, ...

Composite Dark Sectors

We introduce a new paradigm in Composite Dark Sectors, where the full Standard Model (including the Higgs boson) is extended with a strongly-interacting composite sector with global symmetry group \( \mathcal{G} \) spontaneously broken to \( \mathrm{\mathscr{H}}\subset \mathcal{G} \). We show that, under well-motivated conditions, the lightest neutral pseudo Nambu-Goldstone bosons ...

A naturally light Higgs without light top partners

We demonstrate that the inclusion of a realistic lepton sector can relax significantly the upper bound on top partner masses in minimal composite Higgs models, induced by the lightness of the Higgs boson. To that extend, we present a comprehensive survey of the impact of different realizations of the fermion sectors on the Higgs potential, with a special emphasis on the role of the ...

Physical constraints on a class of two-Higgs doublet models with FCNC at tree level

We analyse the constraints and some of the phenomenological implications of a class of two Higgs doublet models where there are flavour-changing neutral currents (FCNC) at tree level but the potentially dangerous FCNC couplings are suppressed by small entries of the CKM matrix V. This class of models have the remarkable feature that, as a result of a discrete symmetry of the ...

From Tevatron’s top and lepton-based asymmetries to the LHC

We define a lepton-based asymmetry in semi-leptonic \( t\overline{t} \) production at the LHC. We show that the ratio of this lepton-based asymmetry and the \( t\overline{t} \) charge asymmetry, measured as a function of the lepton transverse momentum or the \( t\overline{t} \) invariant mass is a robust observable in the Standard Model. It is stable against higher order ...