Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Francisco J. Botella"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-12 (2023)
Abstract In multi-Higgs-doublet models, requiring simultaneously that (i) CP violation only arises spontaneously, (ii) tree level scalar flavour changing couplings are absent and (iii) the fermion mixing matrix is CP violating, can only be achieved i
Externí odkaz:
https://doaj.org/article/6acfc1fe10fb4e31a3413168fe4bddb9
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 10, Pp 1-25 (2022)
Abstract We consider a type I or type X two Higgs doublets model with a modified lepton sector. The generalized lepton sector is also flavor conserving but with the new Yukawa couplings completely decoupled from lepton mass proportionality. The model
Externí odkaz:
https://doaj.org/article/b373999eab7643af8cf75bb6da31e459
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 4, Pp 1-16 (2022)
Abstract We propose a minimal extension of the Standard Model where an up-type vector-like quark, denoted T, is introduced and provides a simple solution to the CKM unitarity problem. We adopt the Botella-Chau parametrization in order to extract the
Externí odkaz:
https://doaj.org/article/d149e990c84e42ad857c9b7349f93b43
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 8, Pp 1-11 (2021)
Abstract We analyse a possible connection between CP violations in the quark and lepton sectors, parametrised by the CKM and PMNS phases. If one assumes that CP breaking arises from complex Yukawa couplings, both in the quark and lepton sectors, the
Externí odkaz:
https://doaj.org/article/25cdf2b46c024ce38f07e9b039a90675
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 8, Pp 1-14 (2020)
Abstract We conjecture the existence of a relation between elementary scalars and fermions, making it plausible the existence of three Higgs doublets. We introduce a Trinity Principle (TP) which, given the fact that there are no massless quarks, requ
Externí odkaz:
https://doaj.org/article/90ff986e708345b9abc3d96598db2a8d
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 8, Pp 1-23 (2019)
Abstract We propose a viable minimal model with spontaneous CP violation in the framework of a two Higgs doublet model. The model is based on a generalised Branco–Grimus–Lavoura model with a flavoured $$\mathbb {Z}_2$$ Z2 symmetry, under which tw
Externí odkaz:
https://doaj.org/article/d70d4e7e2a2046f9944cbf3c07446b89
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 5, Pp 1-1 (2022)
Externí odkaz:
https://doaj.org/article/6ec8f41899ed48e591240e4cde76e684
Autor:
João M. Alves, Francisco J. Botella, Gustavo C. Branco, Fernando Cornet-Gomez, Miguel Nebot, João P. Silva
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-17 (2018)
Abstract We study two-Higgs-doublet models (2HDM) where Abelian symmetries have been introduced, leading to a drastic reduction in the number of free parameters in the 2HDM. Our analysis is inspired in BGL models, where, as the result of a symmetry o
Externí odkaz:
https://doaj.org/article/6e356782ba17433b82227208080462c6
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 12, Pp 1-10 (2017)
Abstract In the presence of quantum-gravity fluctuations (space-time foam), the CPT operator may be ill-defined. Its perturbative treatment leads to a modification of the Einstein–Podolsky–Rosen correlation of the neutral meson system by adding a
Externí odkaz:
https://doaj.org/article/15ac7e5c57eb4e289aa26c190f192a75
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 9, Pp 1-18 (2017)
Abstract We propose a class of two Higgs doublet models where there are flavour changing neutral currents (FCNC) at tree level, but under control due to the introduction of a discrete symmetry in the full Lagrangian. It is shown that in this class of
Externí odkaz:
https://doaj.org/article/9cf7cfae4da6466bab2cafad5f8757dc