Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Ivo de Medeiros Varzielas"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-22 (2024)
Abstract We extend the littlest modular seesaw to a Grand Unified scenario based on SU (5) endowed with three modular S 4 symmetries. We leverage symmetry protected zeroes in the leptonic and down quark sectors to suppress deviations to the littlest
Externí odkaz:
https://doaj.org/article/e3e0967df7714e2a870a9376dd34d28f
Publikováno v:
Nuclear Physics B, Vol 1001, Iss , Pp 116495- (2024)
We consider the framework of flavoured leptoquarks, in models with scalar or vector leptoquarks, and look for constraints to the parameter space of these models. Using primarily direct searches at the Large Hadron Collider (LHC) and precision process
Externí odkaz:
https://doaj.org/article/588b2fb600544eab83852edd5217f768
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 6, Pp 1-22 (2023)
Abstract We revisit the phenomenological predictions of the Universal Texture Zero (UTZ) model of flavour originally presented in [1], and update them in light of both improved experimental constraints and numerical analysis techniques. In particular
Externí odkaz:
https://doaj.org/article/fc590a20e4f94fca8fe2bedcf549bd6d
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 2, Pp 1-22 (2023)
Abstract We present the first complete model of the Littlest Modular Seesaw, based on two right-handed neutrinos, within the framework of multiple modular symmetries, justifying the use of multiple moduli fields which take their values at 3 specific
Externí odkaz:
https://doaj.org/article/3fcfc1bde784494a9c564cbacc3d11cf
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 8, Pp 1-31 (2022)
Abstract We consider the phenomenological signatures of Simplified Models of Flavourful Leptoquarks, whose Beyond-the-Standard Model (SM) couplings to fermion generations occur via textures that are well motivated from a broad class of ultraviolet fl
Externí odkaz:
https://doaj.org/article/e7e4b9104f9e44afa278f7c2156fd183
Autor:
Ivo de Medeiros Varzielas, Diogo Ivo
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 5, Pp 1-12 (2022)
Abstract We study multi-Higgs models with a triplet of $$A_4$$ A 4 or $$S_4$$ S 4 symmetry that is softly-broken. Focusing on parameters that softly break the respective symmetries but preserve the directions of the vacuum expectation values of the t
Externí odkaz:
https://doaj.org/article/f935bb230500489e8946583353728049
Publikováno v:
Nuclear Physics B, Vol 985, Iss , Pp 116031- (2022)
We propose a theory based on the A5 discrete group which successfully accounts for lepton masses and mixings. In the proposed model, the neutrino masses arise from an inverse seesaw mechanism. The leptonic mixing consists in a perturbed golden ratio
Externí odkaz:
https://doaj.org/article/b81fed54fdcf4ffdab798f770c485342
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-12 (2021)
Abstract We develop methods to study the scalar sector of multi-Higgs models with large discrete symmetry groups that are softly broken. While in the exact symmetry limit, the model has very few parameters and can be studied analytically, proliferati
Externí odkaz:
https://doaj.org/article/a8a7eca86219490fb8abec18ec43b777
Publikováno v:
Nuclear Physics B, Vol 984, Iss , Pp 115974- (2022)
We present a model of leptonic mixing based on two A5 modular symmetries using the Weinberg operator. The two modular symmetries are broken to the respective diagonal A5 subgroup. At the effective level, the model behaves as a model with a single A5
Externí odkaz:
https://doaj.org/article/dcddb20c9c5248ba98fcd87acbf536ab
Publikováno v:
Nuclear Physics B, Vol 979, Iss , Pp 115793- (2022)
We construct a lepton flavour model based on two A4 modular symmetries. The two A4 are broken by a bi-triplet field to the diagonal A4 subgroup, resulting in an effective modular A4 flavour symmetry with two moduli. We employ these moduli as stabilis
Externí odkaz:
https://doaj.org/article/6eec1a359717434487f6223cb9de5f5f