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1.
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Type-I Seesaw with eV-Scale Neutrinos
/ Branco, G.C. (Lisbon, CFTP) ; Penedo, J.T. (Lisbon, CFTP) ; Pereira, Pedro M.F. (Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, CFTP ; CERN) ; Silva-Marcos, J.I. (Lisbon, CFTP)
We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra neutrinos is naturally justified by an approximately conserved lepton number symmetry. [...]
arXiv:1912.05875.-
2020-07-23 - 43 p.
- Published in : JHEP 2007 (2020) 164
Article from SCOAP3: PDF; Fulltext: PDF;
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2.
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Leptonic Invariants, Neutrino Mass-Ordering and the Octant of $\theta_{23}$
/ Branco, G.C. (Lisbon, IST ; CERN ; Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, IST ; CERN ; Lisbon, CFTP) ; Silva-Marcos, J.I. (Lisbon, IST ; Lisbon, CFTP)
We point out that leptonic weak-basis invariants are an important tool for the study of the properties of lepton flavour models. In particular, we show that appropriately chosen invariants can give a clear indication of whether a particular lepton flavour model favours normal or inverted hierarchy for neutrino masses and what is the octant of $\theta_{23}$. [...]
arXiv:1705.07758; CERN-TH-2017-075.-
2017-11-06 - 10 p.
- Published in : JHEP 11 (2017) 001
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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3.
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ebook
ebook
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4.
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What if the Masses of the First Two Quark Families are not Generated by the Standard Higgs?
/ Botella, F.J. (Valencia U. ; Valencia U., IFIC ; CERN) ; Branco, G.C. (Lisbon, CFTP ; Lisbon, IST ; CERN) ; Rebelo, M.N. (Lisbon, CFTP ; Lisbon, IST ; CERN) ; Silva-Marcos, J.I. (Lisbon, CFTP ; Lisbon, IST)
We point out that, in the context of the SM, $|V^2_{13}| + | V^2_{23}|$ is expected to be large, of order one. The fact that $|V^2_{13}| + |V^2_{23}| \approx 1.6 \times 10^{-3}$ motivates the introduction of a symmetry S which leads to $V_{CKM} ={1\>\!\!\!\mathrm{I}} $, with only the third generation of quarks acquiring mass. [...]
arXiv:1602.08011; CERN-TH-2016-039; CERN-TH-2016-039.-
Geneva : CERN, 2016-12-29 - 6 p.
- Published in : Phys. Rev. D 94 (2016) 115031
Fulltext: 10.1103_PhysRevD.94.115031 - PDF; arXiv:1602.08011 - PDF; External link: Preprint
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5.
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Natural Quasi-Alignment with two Higgs Doublets and RGE Stability
/ Botella, F.J. (Valencia U. ; Valencia U., IFIC) ; Branco, G.C. (Lisbon, CFTP ; Lisbon, IST ; CERN) ; Coutinho, António M. (Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, CFTP) ; Silva-Marcos, J.I. (Lisbon, CFTP)
In the context of two Higgs doublet models, we study the conditions required in order to have stable quasi-alignment in flavour space. We show that stability under the RGE imposes strong constraints on the flavour structure of the Yukawa couplings associated to each one of the Higgs doublets. [...]
arXiv:1501.07435; CERN-PH-TH-2015-012; CERN-PH-TH-2015-012.-
Geneva : CERN, 2015-06-26 - 16 p.
- Published in : Eur. Phys. J. C 75 (2015) 286
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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6.
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3rd Symposium on Prospects in the Physics of Discrete Symmetries - DISCRETE 2012
3 - 7 Dec 2012
- Lisbon, Portugal
/ Branco, Gustavo C (ed.); Emmanuel-Costa, David (ed.); Gonzalez Felipe, Ricardo (ed.); Joaquim, Filipe R (ed.); Lavoura, L (ed.); Palomares-Ruiz, S (ed.); Rebelo, M Nesbitt (ed.); Romao, Jorge C (ed.); Silva, Jorge P (ed.); Silva-Marcos, J I (ed.)
2013
- Published in : J. Phys.: Conf. Ser. 447 (2013)
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7.
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8.
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Invariants and Flavour in the General Two-Higgs Doublet Model
/ Botella, F.J. (Valencia U., IFIC ; Valencia U.) ; Branco, G.C. (Lisbon, IST ; Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, IST ; Lisbon, CFTP)
The flavour structure of the general Two Higgs Doublet Model (2HDM) is analysed and a detailed study of the parameter space is presented, showing that flavour mixing in the 2HDM can be parametrized by various unitary matrices which arise from the misalignment in flavour space between pairs of various Hermitian flavour matrices which can be constructed within the model. This is entirely analogous to the generation of the CKM matrix in the Standard Model (SM). [...]
CERN-PH-TH-2012-169; arXiv:1210.8163; CERN-PH-TH-2012-169.-
2013-05-13 - 7 p.
- Published in : Phys. Lett. B 722 (2013) 76-82
Preprint: PDF; External link: Preprint
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9.
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10.
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Leptonic CP violation
/ Branco, G.C. (Lisbon, IST ; Lisbon, CFTP ; CERN) ; Felipe, R.Gonzalez (Lisbon, IST ; Lisbon, CFTP ; Lisbon, ISEL) ; Joaquim, F.R. (Lisbon, IST ; Lisbon, CFTP)
Several topics on CP violation in the lepton sector are reviewed. A few theoretical aspects concerning neutrino masses, leptonic mixing, and CP violation will be covered, with special emphasis on seesaw models. [...]
arXiv:1111.5332; CERN-PH-TH-2011-289; CFTP-11-020; CERN-PH-TH-2011-289.-
2012 - 58 p.
- Published in : Rev. Mod. Phys. 84 (2012) 515-565
APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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