arXiv subjects

Sebastián Norero

Publications and source records attributed to Sebastián Norero.

3 recordsLinked to original sources

arXiv2025

Exploring Dimuon Higgs Decay in an Extended Scotogenic Model

We investigate the dimuon Higgs decay $h \to μ^+μ^-$ in the context of an extended Scotogenic model. The model introduces a singlet complex scalar in addition to the standard Scotogenic scalar doublet and singlet fermions, charged under a dark $\mathbb{Z}_2$ symmetry. By exploring the one-loop contributions, we show that the model allows for sizable deviations in the Higgs dimuon decay rate, quantified by the quotient $R_{μμ} = \text{Br}(h \to μ^+μ^-)/\text{Br}(h \to μ^+μ^-)_{\text{SM}}$. Crucially, these deviations comply with experimental limits, including those on $\text{Br}(μ^{+} \to e^{+}γ)$ and $\text{Br}(h \to γγ)$. Such deviations can be tested and constrained by future precision measurements at the LHC.

hep-ph↗

arXiv2021

Fermion Singlet Dark Matter in a Pseudoscalar Dark Matter Portal

We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar. In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations. Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied. We found three viable regions of the parameter space, and the model is sensitive to indirect searches.

hep-ph↗

arXiv2018

Scalar resonance in a top partner model

The phenomenology entailed by a scalar resonance in a top partner model is analysed here in a $SO(5)$ Composite Higgs formalism. Heavy scalar resonances production and their decays modes are explored along a benchmark resonance mass range. The production of single-double partner final states has been scanned along the partner mass scale. QCD drives such production, as well as the SM gauge, Higgs, plus the intermediation of the scalar resonance. Non-zero contributions are induced as long as extra fermion-resonance effects are included. Finally, we have excluded regions of the parameter spaces underlying our framework by imposing the recent LHC searches for vector-like quarks production in $pp$-collisions at 13 TeV. Substantial reduction of the allowed regions occurs if extra fermion-resonance effects are accounted for, leading us to test the involved parametric dependence in the shed light of new matter interactions.

hep-ph↗