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Simulation-based inference in the search for CP violation in leptonic WH production
/ Barrué, Ricardo (LIP, Lisbon ; Lisbon, IST) ; Conde-Muíño, Patricia (LIP, Lisbon ; Lisbon, IST) ; Dao, Valerio (CERN) ; Santos, Rui (Lisbon, ISEL ; Lisbon U., CFTC)
Sources of CP violation beyond the Standard Model (BSM) are required to explain the baryonic asymmetry of the Universe. In this work, we study BSM CP-violating components in the HWW interaction in WH production, parametrized by an effective dimension-6 CP-odd operator. [...]
arXiv:2308.02882.-
2024-04-03 - 14 p.
- Published in : JHEP 2404 (2024) 014
Fulltext: 2308.02882 - PDF; document - PDF;
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Beyond the Standard Model in Vector Boson Scattering Signatures
/ Gallinaro, Michele (LIP, Lisbon) ; Long, Kenneth (CERN) ; Reuter, Jurgen (DESY) ; Ruiz, Richard (Louvain U., CP3) ; Bachas, Dinos (Aristotle U., Thessaloniki) ; Barak, Liron (Tel Aviv U.) ; Bishara, Fady (DESY) ; Brivio, Ilaria (U. Heidelberg, ITP) ; Buarque Franzosi, Diogo (Chalmers U. Tech.) ; Cacciapaglia, Giacomo (IP2I, Lyon ; Lyon U.) et al.
The high-energy scattering of massive electroweak bosons, known as vector boson scattering (VBS), is a sensitive probe of new physics. [...]
arXiv:2005.09889 ; DESY-PROC-2020-002 ; ISBN 978-3-945931-33-2 ; ISSN 1435-8077, CP3-20-17 ; VBSCAN-PUB-04-20.
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16 p.
Fulltext
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3.
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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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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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5.
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3HDM with ∆(27) symmetry and its phenomenological consequences
/ Kalinowski, J. (Warsaw U. ; CERN) ; Kotlarski, W. (Dresden, Tech. U. ; NCBJ, Warsaw) ; Rebelo, M.N. (Lisbon, CFTP) ; de Medeiros Varzielas, I. (Lisbon, CFTP)
We perform a comprehensive analysis of a version of the 3-Higgs doublet model whose scalar potential is invariant under a global $\Delta(27)$ discrete symmetry and where the three scalar doublets are chosen to transform as a triplet under this discrete group. For each of the known tree-level minima we study the mass spectra and use the oblique parameters $STU$ as well as perturbative unitarity to constrain the parameter space of the model. [...]
arXiv:2112.12699; CERN-TH-2021-182.-
2023-02-24 - 27 p.
- Published in : JHEP 2302 (2023) 231
Fulltext: document - PDF; 2112.12699 - PDF;
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Spontaneous symmetry breaking in three-Higgs-doublet $S_3$-symmetric models
/ Emmanuel-Costa, D. (Lisbon, CFTP ; Lisbon, IST) ; Ogreid, O.M. (U. Bergen (main)) ; Osland, P. (Bergen U.) ; Rebelo, M.N. (Lisbon, CFTP ; Lisbon, IST ; CERN)
The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with $S_3$ symmetry and without explicit CP violation. Different vacua require special regions of the parameter space which were analysed in our work. [...]
CERN-TH-2017-070; arXiv:1703.08457.-
2017-07-27 - 11 p.
- Published in : J. Phys.: Conf. Ser. 873 (2017) 012007
Fulltext from Publisher: PDF; Preprint: PDF;
In : 5th Symposium on Prospects in the Physics of Discrete Symmetries, Warsaw, Poland, 28 Nov - 3 Dec 2016, pp.012007
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NLO electroweak corrections in general scalar singlet models
/ Costa, Raul (CERN ; Aveiro U.) ; Sampaio, Marco O. P. (Aveiro U.) ; Santos, Rui (LIP, Minho ; Lisbon U., CFTC ; Lisbon, ISEL)
If no new physics signals are found, in the coming years, at the Large Hadron Collider Run-2, an increase in precision of the Higgs couplings measurements will shift the dicussion to the effects of higher order corrections. In Beyond the Standard Model (BSM) theories this may become the only tool to probe new physics. [...]
arXiv:1704.02327.-
2017-07-17 - 35 p.
- Published in : JHEP 07 (2017) 081
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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10.
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New horizons for fundamental physics with LISA
/ LISA Collaboration
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitational interaction is both strong and dynamical. In this white paper, the Fundamental Physics Working Group of the LISA Consortium summarizes the current topics in fundamental physics where LISA observations of GWs can be expected to provide key input. [...]
arXiv:2205.01597.-
2022-06-30 - 116 p.
- Published in : Living Rev. Relativ. 25 (2022) 4
Fulltext: 2205.01597 - PDF; document - PDF;
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