recid:2859639 - Resultados da pesquisa

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Exploring the viability of a pseudo-Nambu-Goldstone boson as ultralight dark matter in a mass range relevant for strong gravity applications / Morais, António P. (CERN ; U. Aveiro (main)) ; Oliveira, Vinícius (Paraiba U.) ; Onofre, António (Minho U.) ; Pasechnik, Roman (Lund U.) ; Santos, Rui (Lisbon, ISEL ; Lisbon U., CFTC)
We study a simple extension of the Standard Model featuring a dark sector with an ultralight pseudo Nambu-Goldstone boson as dark matter candidate. We focus on the mass range $\mathcal{O}(10^{-20} - 10^{-10})$ eV, relevant for strong gravity applications, and explore its production and evolution in the early Universe. [...]
arXiv:2305.03776; CERN-TH-2023-070; CERN-TH-2023-070.- 2024-08-01 - 23 p. - Published in : Phys. Rev. D 110 (2024) 035008 Fulltext: 2305.03776 - PDF; Publication - PDF;

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(91)

Gravitational waves from a scotogenic two-loop neutrino mass model / Bonilla, Cesar (Catolica del Norte U.) ; Carcamo Hernandez, A.E. (CCTVal, Valparaiso) ; Goncalves, Joao (U. Aveiro (main) ; Lund U.) ; K. N., Vishnudath (CCTVal, Valparaiso) ; Morais, Antonio P. (CERN ; Aveiro U.) ; Pasechnik, Roman (Lund U.)
We propose a framework to account for neutrino masses at the two-loop level. This mechanism introduces new scalars and Majorana fermions to the Standard Model. [...]
arXiv:2305.01964; CERN-TH-2023-071.- 2024-05-01 - 18 p. - Published in : Phys. Rev. D 109 (2024) 095022 Fulltext: 2305.01964 - PDF; Publication - PDF;

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(85)

Interplay between flavor anomalies and neutrino properties / Freitas, Felipe F. (Aveiro U.) ; Gonçalves, João (Aveiro U.) ; Morais, António P. (Aveiro U. ; CERN) ; Pasechnik, Roman (Lund U., Dept. Theor. Phys. ; Lund U.) ; Porod, Werner (Wurzburg U.)
A minimal extension of the Standard Model (SM) featuring two scalar leptoquarks, an SU(2) doublet with hypercharge 1/6 and a singlet with hypercharge 1/3, is proposed as an economical benchmark model for studies of an interplay between flavour physics and properties of the neutrino sector. The presence of such type of leptoquarks radiatively generates neutrino masses and offers a simultaneous explanation for the current B-physics anomalies involving $b \to c \ell \nu_\ell$ decays. [...]
arXiv:2206.01674; CERN-TH-2022-208.- 2023-12-01 - 17 p. - Published in : Phys. Rev. D 108 (2023) 115002 Fulltext: Publication - PDF; 2206.01674 - PDF;

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(64)

Deep Learning Searches for Vector-Like Leptons at the LHC and Electron/Muon Colliders / Morais, António P. (Aveiro U. ; U. Aveiro (main) ; CERN) ; Onofre, António (LIP, Minho) ; Freitas, Felipe F. (Aveiro U. ; U. Aveiro (main)) ; Gonçalves, João (Aveiro U. ; U. Aveiro (main)) ; Pasechnik, Roman (Lund U.) ; Santos, Rui (Lisbon U., CFTC ; Lisbon, ISEL)
The discovery potential of both singlet and doublet vector-like leptons (VLLs) at the Large Hadron Collider (LHC) as well as at the not-so-far future muon and electron machines is explored. The focus is on a single production channel for LHC direct searches while double production signatures are proposed for the leptonic colliders. [...]
arXiv:2108.03926; CERN-TH-2022-217.- 2023-03-21 - 26 p. - Published in : Eur. Phys. J. C 83 (2023) 232 Fulltext: document - PDF; 2108.03926 - PDF;

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(53)

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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(47)

Collider phenomenology of new neutral scalars in a flavored multi-Higgs model / Ferreira, Pedro M. (Lisbon, ISEL ; Lisbon U., CFTC) ; Gonçalves, João (Aveiro U.) ; Morais, António P. (Aveiro U. ; CERN) ; Onofre, António (LIP, Minho) ; Pasechnik, Roman (Lund Observ. ; Lund U., Dept. Theor. Phys.) ; Vatellis, Vasileios (Aveiro U.)
In this work, we propose and explore for the first time a new collider signature of heavy neutral scalars typically found in many distinct classes of multi-Higgs models. This signature, particular relevant in the context of the Large Hadron Collider (LHC) measurements, is based on a topology with two charged leptons and four jets arising from first and second generation quarks. [...]
arXiv:2211.10109; CERN-TH-2022-194.- 2023-05-01 - 21 p. - Published in : Phys. Rev. D 107 (2023) 095041 Fulltext: Publication - PDF; 2211.10109 - PDF;

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(46)

New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector / CAST Collaboration
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope (CAST) has been searching for solar axions via their back conversion to X-ray photons in a 9-T 10-m long magnet directed towards the Sun. [...]
arXiv:2406.16840.- 2024-11-27 - 9 p. - Published in : Phys. Rev. Lett. 133 (2024) 221005 Fulltext: Publication - PDF; 2406.16840 - PDF;

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(43)

Radiative lifetime of the A 2Π1/2 state in RaF with relevance to laser cooling / ISOLDE Collaboration
The radiative lifetime of the $A$$^2 \Pi_{1/2}$ (v=0) state in radium monofluoride (RaF) is measured to be 35(1) ns. The lifetime of this state and the related decay rate $\Gamma = 2.86(8) \times 10^7$$s^{-1}$ are of relevance to the laser cooling of RaF via the optically closed $A$$^2 \Pi_{1/2} \leftarrow X$$^2\Sigma_{1/2}$ transition, which makes the molecule a promising probe to search for new physics. [...]
arXiv:2403.09336.- 2024-07-22 - 8 p. - Published in : Phys. Rev. A 110 (2024) L010802 Fulltext: PDF;

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(42)

K$^{*}$(892)$^{\pm}$ resonance production in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV / ALICE Collaboration
The production of K$^{*}$(892)$^{\pm}$ meson resonance is measured at midrapidity ($|y|<$ 0.5) in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}} =$ 5.02 TeV using the ALICE detector at the Large Hadron Collider. The resonance is reconstructed via its hadronic decay channel K$^{*}$(892)$^{\pm} \rightarrow \mathrm{K^{0}_{S} \pi^{\pm}}$. [...]
arXiv:2308.16119; CERN-EP-2023-176.- Geneva : CERN, 2024-04-03 - 18 p. - Published in : Phys. Rev. C 109 (2024) 044902 Draft (restricted): PDF; Fulltext: 2308.16119 - PDF; Publication - PDF;

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Photoproduction of ${\rm K}^{+} {\rm K}^{−}$ Pairs in Ultraperipheral Collisions / ALICE Collaboration
${\rm K}^{+} {\rm K}^{−}$ pairs may be produced in photonuclear collisions, either from the decays of photoproduced $\phi (1020)$ mesons, or directly as non-resonant ${\rm K}^{+} {\rm K}^{−}$ pairs. Measurements of ${\rm K}^{+} {\rm K}^{−}$ photoproduction probe the couplings between the $\phi (1020)$ and charged kaons with photons and nuclear targets. [...]
arXiv:2311.11792; CERN-EP-2023-248.- Geneva : CERN, 2024-05-31 - 13 p. - Published in : Phys. Rev. Lett. 132 (2024) 222303 Draft (restricted): PDF; Fulltext: 2311.11792 - PDF; Publication - PDF;

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