Year: 2022
Type: article
Abstract: 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 single (usually Majorana) sterile fermion state that mixes with only one lepton flavour. However, most of the extensions of the Standard Model involving sterile fermions predict the existence of several HNLs, with complex mixing patterns to all flavours. Consequently, most of the experimental bounds for HNLs need to be recast before being applied to a generic scenario. In this work, we focus on LHC searches of heavy neutral leptons and discuss how to reinterpret the available bounds when it comes to consider mixings to all active flavours, not only in the case with a single HNL, but also in the case when more heavy neutral leptons are involved. In the latter case, we also consider the possibility of interference effects and show how the bounds on the parameter space should be recast.
Source: The European Physical Journal C
Institutions: Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Universitat de València, Instituto de Física Corpuscular, Instituto de Física Teórica, Universidad Autónoma de Madrid
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1175115578, G1422035950, G1936155967, G210041235, G2262748287, G2601397997, G2713276326, G282847690, G300979063, Hunting Invisibles: Dark sectors, Dark matter and Neutrinos, G3220251042, G34346518, G3480869486, G3565621276, G3681454997, G3857581125, G4042783231, G425668148, G434337789, G4442677895, G4526231891, G4861624602, G5080475149, G5195188938, G5391483016, G603324873, G6417970939, G7084143925, G792975244, G8684520763
OpenAlex ID: W4295035204