141 citations · 656 across the 31 of their papers we have counts for
32 papers · 1 filter
Probing the heavy neutrino hypothesis
Xabier Marcano
There is a strong experimental program searching for massive sterile neutrinos. Here we focus on the heavy regime above the GeV scale, where their existence can be probed in either…
Bounds on lepton non-unitarity and heavy neutrino mixing
Mattias Blennow, Enrique Fernández-Martínez, Josu Hernández-García +3
We present an updated and improved global fit analysis of current flavor and electroweak precision observables to derive bounds on unitarity deviations of the leptonic mixing matri…
Lepton Flavor Violation from diphoton effective interactions
Fabiola Fortuna, Xabier Marcano, Marcela Marín +1
We consider charged lepton flavor violating transitions mediated by the diphoton effective interactions and explore which processes can probe them better. Our anal…
Indirect upper limits on from
Fabiola Fortuna, Alejandro Ibarra, Xabier Marcano +2
We perform an effective field theory analysis to correlate the charged lepton flavor violating processes and . Using the current upper bounds…
Heavy Neutral Leptons Beyond Simplified Scenarios
Gioacchino Piazza, Asmaa Abada, Pablo Escribano +1
Heavy neutral leptons (HNL) constitute the building blocks of several neutrino mass generation mechanisms. Experimental searches depend on their masses and mixings with the active…
HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis
Enrique Fernández-Martínez, Xabier Marcano, Daniel Naredo-Tuero
Low-scale seesaw variants protected by lepton number symmetry provide a natural explanation of the smallness of neutrino masses but, unlike their higher-scale counterparts, with po…
Collider Searches for Heavy Neutral Leptons: beyond simplified scenarios
Asmaa Abada, Pablo Escribano, Xabier Marcano +1
With very few exceptions, the large amount of available experimental bounds on heavy neutral leptons - HNL - have been derived relying on the assumption of the existence of a singl…
Indirect constraints on lepton-flavour-violating quarkonium decays
Lorenzo Calibbi, Tong Li, Xabier Marcano +1
Within an effective-field-theory framework, we present a model-independent analysis of the potential of discovering new physics by searching for lepton flavour violation in heavy q…
A method for approximating optimal statistical significances with machine-learned likelihoods
Ernesto Arganda, Xabier Marcano, Víctor Martín Lozano +4
Machine-learning techniques have become fundamental in high-energy physics and, for new physics searches, it is crucial to know their performance in terms of experimental sensitivi…
Z lepton flavour violation as a probe for new physics at future colliders
Lorenzo Calibbi, Xabier Marcano, Joydeep Roy
In this work we assess the potential of discovering new physics by searching for lepton-flavour-violating (LFV) decays of the boson, , at the proposed circu…
Gauged Inverse Seesaw from Dark Matter
Asmaa Abada, Nicolás Bernal, Antonio E. Cárcamo Hernández +2
We propose an economical model addressing the generation of the Inverse Seesaw mechanism from the spontaneous breaking of a local , with the Majorana masses of the ster…
Search for Light Exotic Fermions in Double-Beta Decays
Matteo Agostini, Elisabetta Bossio, Alejandro Ibarra +1
The Standard Model of Particle Physics predicts the double- decay of certain nuclei with the emission of two active neutrinos. In this letter, we argue that double- decay exp…
Flavor techniques for LFV processes: Higgs decays in a general seesaw model
Xabier Marcano, Roberto A. Morales
Lepton flavor violating processes are optimal observables to test new physics, since they are forbidden in the Standard Model while they may be generated in new theories. The usual…
Model-independent search strategy for the lepton-flavor-violating heavy Higgs boson decay to at the LHC
Ernesto Arganda, Xabier Marcano, Nicolás I. Mileo +2
In this work we present a model-independent search strategy at the LHC for heavy Higgs bosons decaying into a tau and a muon, , showing a plausible tendency to…
Searching for Heavy Neutral Leptons with Displaced Vertices at the LHC
Asmaa Abada, Nicolás Bernal, Marta Losada +1
Heavy Neutral Leptons are naturally present in many well-motivated extensions of the Standard Model. If their mass is of few dozens of GeVs, they can be long-lived and lead to even…
Heavy Neutral Leptons and displaced vertices at LHC
Xabier Marcano
Heavy neutral leptons are present in many well-motivated beyond the Standard Model theories, sometimes being accessible at present colliders. Depending on their masses and coupling…
Inclusive Displaced Vertex Searches for Heavy Neutral Leptons at the LHC
Asmaa Abada, Nicolás Bernal, Marta Losada +1
The inclusion of heavy neutral leptons to the Standard Model particle content could provide solutions to many open questions in particle physics and cosmology. The modification of…
One-loop effective LFV vertex from heavy neutrinos within the Mass Insertion Approximation
M. J. Herrero, X. Marcano, R. Morales +1
In this paper we study the effective lepton flavor violating vertex of an electroweak gauge boson and two charged leptons with different flavor, and , that is genera…
Beta and Neutrinoless Double Beta Decays with KeV Sterile Fermions
Asmaa Abada, Alvaro Hernandez-Cabezudo, Xabier Marcano
Motivated by the capability of the KATRIN experiment to explore the existence of KeV neutrinos in the KeV mass range, we explore the viability of minimal extensions of t…
Resonant events at the LHC from a unitarized study of the EChL
R. L. Delgado, A. Dobado, D. Espriu +4
We present a study of the production of vector resonances at the LHC via vector boson scattering and explore the sensitivities to these resonances for expected LHC luminosit…
Lepton flavor violation from low scale seesaw neutrinos with masses reachable at the LHC
X. Marcano
Flavor physics has been crucial in the development of particle physics and it will keep being so in the future. Nowadays, this kind of processes, in particular lepton flavor changi…
Higgs effective vertex from heavy and applications to LFV phenomenology
Maria J. Herrero, Ernesto Arganda, Xabier Marcano +2
We present a new computation of the Lepton Flavor Violating effective vertex involving the Higgs boson and two leptons with different flavors. This vertex is generated from the int…
Production of vector resonances at the LHC via WZ-scattering: a unitarized EChL analysis
R. L. Delgado, A. Dobado, D. Espriu +4
In the present work we study the production of vector resonances at the LHC by means of the vector boson scattering and explore the sensitivities to these resonances fo…
Charged lepton flavour violation from low scale seesaw neutrinos
V. De Romeri, M. J. Herrero, X. Marcano +1
In the work presented here, we have studied the impact of right handed neutrinos, which are introduced to account for the evidence of neutrino masses, on charged lepton flavour vio…