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- A three Higgs doublet model with symmetry-suppressed flavour changing neutral currentsPublication . Das, Dipankar; Ferreira, Pedro Miguel; Morais, António P.; Padilla-Gay, Ian; Pasechnik, Roman; Rodrigues, J. PedroWe construct a three-Higgs doublet model with a flavour non-universal U(1) x DOUBLE-STRUCK CAPITAL Z(2) symmetry. That symmetry induces suppressed flavour-changing interactions mediated by neutral scalars. New scalars with masses below the TeV scale can still successfully negotiate the constraints arising from flavour data. Such a model can thus encourage direct searches for extra Higgs bosons in the future collider experiments, and includes a non-trivial flavour structure.
- Ultralight bosons for strong gravity applications from simple Standard Model extensionsPublication . Freitas, Felipe F.; Herdeiro, Carlos A. R.; Morais, António P.; Onofre, Antonio; Pasechnik, Roman; Radu, Eugen; Sanchis-Gual, Nicolas; Santos, RuiWe construct families, and concrete examples, of simple extensions of the Standard Model that can yield ultralight real or complex vectors or scalars with potential astrophysical relevance. Specifically, the mass range for these putative fundamental bosons (∼ 10−10 − 10−20 eV) would lead dynamically to both new non-black hole compact objects (bosonic stars) and new non-Kerr black holes, with masses of ∼ M to ∼ 1010M, corresponding to the mass range of astrophysical black hole candidates (from stellar mass to supermassive). For each model, we study the properties of the mass spectrum and interactions after spontaneous symmetry breaking, discuss its theoretical viability and caveats, as well as some of its potential and most relevant phenomenological implications linking them to the physics of compact objects.
- Phenomenology of a flavored multiscalar Branco-Grimus-Lavoura-like model with three generations of massive neutrinosPublication . Ferreira, Pedro Miguel; Freitas, Felipe F.; Pino Gonçalves, João; Morais, António P.; Pasechnik, Roman; Vatellis, VasileiosIn this paper, we present several possible anomaly free implementations of the Branco-Grimus-Lavoura (BGL) model with two Higgs doublets and one singlet scalar. The model also includes three generations of massive neutrinos that get their mass via a type-I seesaw mechanism. A particular anomaly free realization, which we dub νBGL-1 scenario, is subjected to an extensive phenomenological analysis, from the perspective of flavor physics and collider phenomenology.
- Collider phenomenology of new neutral scalars in a flavored multi-higgs modelPublication . Ferreira, Pedro; Gonçalves, João; de Aguiar e Pestana de Morais, António; Onofre, Antonio; Pasechnik, Roman; Vatellis, VasileiosIn this work, we propose and explore for the first time a new collider signature of heavy neutral scalars typically found in many distinct classes of multi-Higgs models. This signature, particularly relevant in the context of the Large Hadron Collider (LHC) measurements, is based on a topology with two charged leptons and four jets arising from first and second generation quarks. As an important benchmark scenario of the multi-Higgs models, we focus on a recently proposed Branco-Grimus-Lavoura (BGL) type model enhanced with an Abelian U(1) flavor symmetry and featuring an additional sector of right-handed neutrinos. We discuss how kinematics of the scalar fields in this model can be used to efficiently separate the signal from the dominant backgrounds and explore the discovery potential of the new heavy scalars in the forthcoming LHC runs. The proposed method can be applied for analysis of the statistical significance of heavy scalars' production at the LHC and future colliders in any multi-Higgs model.