Amanda Rodríguez | Searcharxiv

arXiv2026

Vector Dark Matter in the Fundamental Representation of $SU(2)_{L}$: Sommerfeld Enhancement and Indirect Detection

In this work, we study an extension of the Standard Model that includes a new massive vector field in the fundamental representation of $SU(2)_{L}$. The neutral component of this field provides a natural dark matter candidate. We compute the annihilation cross-section including Sommerfeld enhancement and the gamma-ray flux arising from dark matter annihilation. We derive constraints on the model parameter space using current gamma-ray observations and investigate the prospects for future searches. We find that the model exhibits resonances for dark matter masses in the range $2-10$ TeV, whose properties are influenced by the value of the Higgs portal coupling. We show that part of the remaining parameter space can be probed by CTA in the near future.

hep-ph↗

arXiv2025

Type I + II Seesaw Model in light of the New Neutrino Oscillation Measurements

Global analysis of neutrino oscillation data slightly favors normal mass ordering. In this work, we investigate an extended scalar sector that naturally gives rise to a type I + II seesaw mechanism after spontaneous symmetry breaking and explore the interplay between collider physics and lepton flavor violation, adopting normal ordering. In particular, we focus on the rare muon decays $μ\rightarrow e γ$ and $μ\rightarrow 3e$ and the same-sign dilepton searches at LHC, a canonical signature of a doubly charged scalar. We conclude that neither the precise value of the sum of the neutrino masses, taken from DESI data that favors $\sum m_ν=0.07$~eV, nor alternative cosmological fits which prefer a more relaxed limit $\sum m_ν=0.1$~eV, significantly changes the theoretical prediction for these rare decays. However, we observe an interesting interplay between collider physics and lepton flavor violation depending on the choices of the vacuum expectation value of the triplet scalar. In particular, we find that $μ\rightarrow 3e$ is more constraining than $μ\rightarrow eγ$, and the $μ\rightarrow 3e$ decay can yield a lower mass limit of $3$~TeV on the doubly charged scalar, surpassing current LHC constraint.

hep-ph↗