Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Branco, Gustavo C."'
We study, in a systematic way, the $V_{\text{CKM}}$ unitarity relations which arise in extensions of the three generations Standard Model (3gSM) involving the addition of vector-like quarks (VLQ). In particular, we emphasize the effect of the presenc
Externí odkaz:
http://arxiv.org/abs/2307.13073
Autor:
Alves, João M., Botella, Francisco J., Branco, Gustavo C., Cornet-Gomez, Fernando, Nebot, Miguel
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 above con
Externí odkaz:
http://arxiv.org/abs/2105.14054
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, requires the
Externí odkaz:
http://arxiv.org/abs/2005.13518
Publikováno v:
Phys. Rev. D 102, 035007 (2020)
We present new variants of the Two Higgs-Doublet Model where all Yukawa couplings with physical Higgs bosons are controlled by the quark mixing matrices of both chiralities, as well as, in one case, the ratio between the two scalar doublets' vacuum e
Externí odkaz:
http://arxiv.org/abs/2004.11291
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 $\mathbb{Z}_2$ symmetry, under which two of the quark fami
Externí odkaz:
http://arxiv.org/abs/1808.00493
Autor:
Alves, Joao M., Botella, Francisco J., Branco, Gustavo C., Cornet-Gomez, Fernando, Nebot, Miguel, Silva, Joao P.
Publikováno v:
Phys. Rev. D 98, 035046 (2018)
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 of the Lag
Externí odkaz:
http://arxiv.org/abs/1803.11199
We show that a simple extension of the Standard Model involving the introduction of vector-like quarks and heavy neutrinos, provides an explanation of the so called B-anomalies in $b\to s\ell\bar\ell$ transitions. Vector-like quarks can explain, in t
Externí odkaz:
http://arxiv.org/abs/1712.04470
Autor:
Alves, Joao M., Botella, Francisco J., Branco, Gustavo C., Cornet-Gomez, Fernando, Nebot, Miguel
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 models,
Externí odkaz:
http://arxiv.org/abs/1703.03796
The invariant approach is a powerful method for studying CP violation for specific Lagrangians. The method is particularly useful for dealing with discrete family symmetries. We focus on the CP properties of unbroken $\Delta(27)$ invariant Lagrangian
Externí odkaz:
http://arxiv.org/abs/1505.06165
Publikováno v:
Phys. Rev. D 92, 036007 (2015)
We propose the use of basis invariants, valid for any choice of CP transformation, as a powerful approach to studying specific models of CP violation in the presence of discrete family symmetries. We illustrate the virtues of this approach for exampl
Externí odkaz:
http://arxiv.org/abs/1502.03105