8 papers
Reheating the FCC: Probing Early Matter Domination with Long-Lived Particles
Nicolás Bernal, Giovanna Cottin, Kuldeep Deka +1
We study a GeV-scale Higgs-portal scalar that can dominate the early Universe and later decay into Standard Model states, ending an early matter-dominated era. Ordinary cosmic…
Can LLP detectors probe the reheating temperature? A case study of vector dark matter
Paulo Areyuna C, Giovanna Cottin, Bastián DÃaz Sáez +2
We study an extension of the singlet-scalar Higgs portal featuring a dark vector and a real scalar . The vector is a dark matter (DM) candidate, while is long-lived…
Testing frozen-in pNGB dark matter with a long-lived dark Higgs
Nicolás Bernal, Giovanna Cottin, Bastián DÃaz Sáez +1
We consider a simple Higgs portal dark matter (DM) model, where the Standard Model is extended with a complex singlet scalar. The imaginary part of the scalar becomes a massive and…
Heavy neutral leptons and top quarks in effective field theory
Rebeca Beltrán, Giovanna Cottin, Julian Günther +3
We study the phenomenology of heavy neutral leptons (HNLs) at the LHC in effective field theory, concentrating on operators with top quarks. Depending on the operator choice…
Probing light neutralinos from pair-produced sleptons with displaced vertices at the high-luminosity LHC
Giovanna Cottin, Juan Carlos Helo, Fabián Hernández-Pinto +2
We study light neutralinos () with masses ranging from 10 GeV to several hundred GeV within the framework of R-parity-violating (RPV) supersymmetry. These light neut…
Long-lived particle phenomenology in one-loop neutrino mass models with dark matter
Carolina Arbeláez, Giovanna Cottin, Juan Carlos Helo +2
Neutrino masses and dark matter (DM) might have a common origin. The scotogenic model can be considered the proto-type model realizing this idea, but many other variants exist. In…