recid:2815721 - Резултати от търсенето

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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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Split NMSSM from dimensional reduction of a $10D$, $\mathcal{N}=1$$E_8$ over $SU(3)/U(1)\times U(1)\times Z_3$ / Patellis, Gregory (Lisbon, CFTP) ; Porod, Werner (Wurzburg U.) ; Zoupanos, George (Natl. Tech. U., Athens ; Munich, Max Planck Inst. ; CERN)
We examine an extension of the Standard Model which results from a $10D$, $\mathcal{N}=1$, $E_8$ gauge theory. The theory is dimensionally reduced over a $M_4 \times B_0/ \mathbf{Z}_3 $ space, where $B_0$ is the nearly-Kähler manifold $SU(3)/U(1) \times U(1)$ and $\mathbf{Z}_3$ is a freely acting discrete group on $B_0$ that triggers a Wilson flux breaking, leading to an $\mathcal{N}=1$, $SU(3)^3\times U(1)^2$ effective theory in $4D$. [...]
arXiv:2307.10014; CERN-TH-2023-124.- 2024-01-05 - 18 p. - Published in : JHEP 2401 (2024) 021 Fulltext: 2307.10014 - PDF; document - PDF;

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(85)

Reduction of couplings in the Type-II 2HDM / Pech, M.A. May (Mexico U.) ; Mondragón, M. (Mexico U.) ; Patellis, G. (Lisbon, CFTP ; Lisbon, IST) ; Zoupanos, G. (Natl. Tech. U., Athens ; Heidelberg U. ; Munich, Max Planck Inst. ; CERN)
The idea of reduction of couplings consists in the search for relations between seemingly independent couplings of a renormalizable theory that are renormalization group invariant. In this article, we demonstrate the existence of such 1-loop relations among the top Yukawa, the Higgs quartic and the gauge colour couplings of the Type-II Two Higgs Doublet Model at a high-energy boundary. [...]
arXiv:2310.14014.- 2023-12-14 - 7 p. - Published in : Eur. Phys. J. C 83 (2023) 1129 Fulltext: 2310.14014 - PDF; Publication - PDF;

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(70)

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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(64)

Strong Cosmic Censorship: the nonlinear story / Luna, Raimon (ICC, Barcelona U.) ; Zilhão, Miguel (Lisbon, CENTRA ; CERN) ; Cardoso, Vitor (Lisbon, CENTRA) ; Costa, João L. (ISCTE, Lisbon ; U. Lisbon (main)) ; Natário, José (IST, Lisbon (main))
A satisfactory formulation of the laws of physics entails that the future evolution of a physical system should be determined from appropriate initial conditions. The existence of Cauchy horizons in solutions of the Einstein field equations is therefore problematic, and expected to be an unstable artifact of General Relativity. [...]
arXiv:1810.00886; arXiv:2012.08413.- 2019-03-16 - 9 p. Fulltext: PDF; Fulltext from Publisher: PDF; External links: 00001 Mass function~\eqref{eq:mass} and Kretschmann scalar as functions of $\overset{\circ}{v}$ for configurations {\bf B1} (red solid line) and {\bf B2} (blue dashed line). Thin lines are evaluated at $u=u_{\rm EH} + 1$ and thick lines are evaluated at $u=u_{\rm EH} + 2$.; 00000 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.; 00011 Same as Fig.~\ref{fig:no_inflation}, for configurations {\bf C1} (red solid) and {\bf C2} (blue dashed).; 00007 Mass function~\eqref{eq:mass} and Kretschmann scalar as functions of $\overset{\circ}{v}$ for configurations {\bf A1} (red solid line) and {\bf A2} (blue dashed line). Thin lines are evaluated at $u=u_{\rm EH} + 1$ and thick lines are evaluated at $u=u_{\rm EH} + 2$. These results are consistent with the existence of mass inflation leading to a weak singularity.; 00005 Constraint violations during our evolutions of configurations {\bf B}.; 00004 Constraint violations during our evolutions of configurations {\bf B}.; 00006 Radius function for constant-$u$ slices in a configuration with $M_0 = 1.0$, $Q = 0.9$, $\Lambda = 0.06$, $\mu = 0$, $A = 0.4$, $v_c = 3.0$ and $w = 0.25$. Dashed-dotted green lines reach infinity, full blue lines hit the CH and red dashed lines hit the singularity at $r=0$.; 00010 Massless scalar field along the event horizon with corresponding ``local power'' for a configuration with $M_0 = 1.0$, $Q = 0.95$, $\Lambda = 0$, $\mu = 0$, $A = 0.01$, $v_c = 6.0$ and $w = 0.25$. The power-law decay $\Phi \sim v^{-3}$ matches to a very good precision the one expected from linearized analysis~\cite{Price:1971fb}, and reproduces well previous nonlinear results~\cite{Burko:1997tb}.; 00002 Massless scalar field along the event horizon with corresponding ``local power'' for a configuration with $M_0 = 1.0$, $Q = 0.95$, $\Lambda = 0$, $\mu = 0$, $A = 0.01$, $v_c = 6.0$ and $w = 0.25$. The power-law decay $\Phi \sim v^{-3}$ matches to a very good precision the one expected from linearized analysis~\cite{Price:1971fb}, and reproduces well previous nonlinear results~\cite{Burko:1997tb}.; Fulltext from Publisher; 00003 $\delta_{N,64} (K)$ at $u=18.2$ for configuration {\bf B1}. 20 domains were employed in the $v$ direction, where each domain has $N$ points. The plot clearly shows exponential convergence until $N\approx40$.; Fulltext; 00008 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.; 00009 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.

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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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(54)

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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Moving black holes: energy extraction, absorption cross-section and the ring of fire / Cardoso, Vitor (Lisbon, CENTRA ; CERN) ; Vicente, Rodrigo (Lisbon, CENTRA)
We consider the interaction between a plane wave and a (counter-moving) black hole. We show that energy is transferred from the black hole to the wave, giving rise to a negative absorption cross-section. [...]
arXiv:1906.10140.- 2019-10-02 - 6 p. - Published in : Phys. Rev. D 100 (2019) 084001 Fulltext: PDF; Fulltext from Publisher: 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. - 16 p.
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Scattering of scalar, electromagnetic and gravitational waves from binary systems / Annulli, Lorenzo (Lisbon, CENTRA) ; Bernard, Laura (Lisbon, CENTRA) ; Blas, Diego (King's Coll. London ; CERN) ; Cardoso, Vitor (Lisbon, CENTRA ; CERN)
The direct detection of gravitational waves crowns decades of efforts in the modelling of sources and of increasing detectors' sensitivity. With future third-generation Earth-based detectors or space-based observatories, gravitational-wave astronomy will be at its full bloom. [...]
arXiv:1809.05108; CERN-TH-2018-184; KCL-PH-TH/2018-34.- 2018-10-02 - 20 p. - Published in : Phys. Rev. D 98 (2018) 084001 Fulltext: PDF; Fulltext from Publisher: PDF;

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