79 citations · 569 across the 24 of their papers we have counts for
25 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 Díaz 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 an…
Testing frozen-in pNGB dark matter with a long-lived dark Higgs
Nicolás Bernal, Giovanna Cottin, Bastián Díaz 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…
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 neutr…
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…
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…
Quark flavor violation and axion-like particles from top-quark decays at the LHC
Kingman Cheung, Fei-Tung Chung, Giovanna Cottin +1
We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interact…
Reinterpretation of searches for long-lived particles from meson decays
Rebeca Beltrán, Giovanna Cottin, Martin Hirsch +2
Many models beyond the Standard Model predict light and feebly interacting particles that are often long-lived. These long-lived particles (LLPs) in many cases can be produced from…
Long-lived heavy neutral leptons from mesons in effective field theory
Rebeca Beltrán, Giovanna Cottin, Juan Carlos Helo +3
In the framework of the low-energy effective field theory of the Standard Model extended with heavy neutral leptons (HNLs), we calculate the production rates of HNLs from meson dec…
Long-lived heavy neutral leptons with a displaced shower signature at CMS
Giovanna Cottin, Juan Carlos Helo, Martin Hirsch +3
We study the LHC discovery potential in the search for heavy neutral leptons (HNL) with a new signature: a displaced shower in the CMS muon detector, giving rise to a large cluster…
Searching for light neutralinos with a displaced vertex at the LHC
Giovanna Cottin, Juan Carlos Helo, Fabián Hernández-Pinto +2
We study a bino-like light neutralino () produced at the LHC from the decay of a scalar lepton () through the process $pp\to \tilde e_{L} \to e\tilde χ_1^…
Long-lived heavy neutral leptons at the LHC: four-fermion single- operators
Rebeca Beltrán, Giovanna Cottin, Juan Carlos Helo +3
Interest in searches for heavy neutral leptons (HNLs) at the LHC has increased considerably in the past few years. In the minimal scenario, HNLs are produced and decay via their mi…
Revisiting the scotogenic model with scalar dark matter
Ivania M. Ávila, Giovanna Cottin, Marco A. Díaz
The scotogenic model is a well motivated scenario that provides both an explanation for neutrino masses and for dark matter. We focus on a real scalar dark matter candidate in this…
Heavy neutral leptons in effective field theory and the high-luminosity LHC
Giovanna Cottin, Juan Carlos Helo, Martin Hirsch +2
Heavy neutral leptons (HNLs) with masses around the electroweak scale are expected to be rather long-lived particles, as a result of the observed smallness of the active neutrino m…
Displaced Neutrino Jets at the LHeC
Giovanna Cottin, Oliver Fischer, Sanjoy Mandal +2
Extending the Standard Model with right-handed neutrinos (RHNs) is well motivated by the observation of neutrino oscillations. In the type-I seesaw model, the RHNs interact with th…
Long-lived charged particles and multi-lepton signatures from neutrino mass models
Carolina Arbeláez R, Giovanna Cottin, Juan Carlos Helo +1
Lepton number violation (LNV) is usually searched for by the LHC collaborations using the same-sign di-lepton plus jet signature. In this paper we discuss multi-lepton signals of L…
Collider Probes of Real Triplet Scalar Dark Matter
Cheng-Wei Chiang, Giovanna Cottin, Yong Du +2
We study discovery prospects for a real triplet extension of the Standard Model scalar sector at the Large Hadron Collider (LHC) and a possible future 100 TeV collider. We foc…
Displaced heavy neutrinos from decays at the LHC
Cheng-Wei Chiang, Giovanna Cottin, Arindam Das +1
We study the LHC sensitivity to probe a long-lived heavy neutrino in the context of models. We focus on displaced vertex signatures of when pair produced via a , d…
Boosted Tagging with Jet Charge and Deep Learning
Yu-Chen Janice Chen, Cheng-Wei Chiang, Giovanna Cottin +1
We demonstrate that the classification of boosted, hadronically-decaying weak gauge bosons can be significantly improved over traditional cut-based and BDT-based methods using deep…
Revisiting the LHC reach in the displaced region of the minimal left-right symmetric model
Giovanna Cottin, Juan Carlos Helo, Martin Hirsch +1
We revisit discovery prospects for a long-lived sterile neutrino at the Large Hadron Collider (LHC) in the context of left-right symmetric theories. We focus on a displaced ver…
Discovery potential of light sterile neutrinos with displaced vertices
Giovanna Cottin
Many models of new physics beyond the Standard Model are able to describe massive, long-lived particles with macroscopic decays, which can be reconstructed as displaced vertices in…
Global fits in the Georgi-Machacek model
Cheng-Wei Chiang, Giovanna Cottin, Otto Eberhardt
Off the beaten track of scalar singlet and doublet extensions of the Standard Model, triplets combine an interesting LHC phenomenology with an explanation for neutrino masses. The…
Displaced vertices as probes of sterile neutrino mixing at the LHC
Giovanna Cottin, Juan Carlos Helo, Martin Hirsch
We investigate the reach at the LHC to probe light sterile neutrinos with displaced vertices. We focus on sterile neutrinos with masses (5-30) GeV, that are produ…
Reconstructing particle masses in events with displaced vertices
Giovanna Cottin
We propose a simple way to extract particle masses given a displaced vertex signature in event topologies where two long-lived mother particles decay to visible particles and an in…