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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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(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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(87)

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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(55)

Exploring mixed lepton-quark interactions in non-resonant leptoquark production at the LHC / Gonçalves, João (Aveiro U. ; Lund U., Dept. Theor. Phys.) ; Morais, António P. (Aveiro U. ; CERN) ; Onofre, António (Minho U.) ; Pasechnik, Roman (Lund U., Dept. Theor. Phys.)
Searches for new physics (NP) at particle colliders typically involve multivariate analysis of kinematic distributions of final state particles produced in a decay of a hypothetical NP resonance. Since the pair-production cross-sections mediated by such resonances are strongly suppressed by the NP scale, this analysis becomes less relevant for NP searches for masses of the BSM resonance above 1 TeV. [...]
arXiv:2306.15460; CERN-TH-2023-072.- 2023-11-22 - 26 p. - Published in : JHEP 2311 (2023) 147 Fulltext: 2306.15460 - PDF; document - PDF;

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(50)

Gauge Couplings Evolution from the Standard Model, through Pati–Salam Theory, into E$_{8}$ Unification of Families and Forces / Aranda, Alfredo (Colima U. ; Dual C-P Inst. High Energy Phys.) ; de Anda, Francisco J. (Tepatitlan's Inst. Theor. Studies) ; Morais, António P. (Aveiro U. ; CERN) ; Pasechnik, Roman (Lund U., Dept. Theor. Phys.)
We explore the potential of ultimate unification of the Standard Model matter and gauge sectors into a single $E_8$ superfield in ten dimensions via an intermediate Pati-Salam gauge theory. Through a consistent realisation of a $\mathbb{T}^6/(\mathbb{Z}_6\times \mathbb{Z}_2)$ orbifolding procedure accompanied by the Wilson line breaking mechanism and Renormalisation Group evolution of gauge couplings, we have established several benchmark scenarios for New Physics that are worth further phenomenological exploration..
arXiv:2011.13902.- 2023-02-08 - 17 p. - Published in : Universe 9 (2023) 90 Fulltext: Publication - PDF; 2011.13902 - 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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(40)

Correlating $h\to\mu^+\mu^-$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks / Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Mueller, Dario (Zurich U. ; PSI, Villigen) ; Saturnino, Francesco (Bern U.)
Recently, both ATLAS and CMS measured the decay $h\to\mu^+\mu^-$, finding a signal strength with respect to the Standard Model expectation of $1.2\pm0.6$ and $1.19\substack{+0.41+0.17\\-0.39 -0.16}$, respectively. This provides, for the first time, evidence that the Standard Model Higgs couples to second generation fermions. [...]
arXiv:2008.02643; CERN-TH-2020-134; PSI-PR-20-12; ZU-TH 28/20.- 2021-07-07 - 7 p. - Published in : Phys. Rev. Lett. 127 (2021) 021801 Fulltext from publisher: PDF; External link: CERN Courier article

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(39)

Forward-backward asymmetry in $B\to D^{*}\ell\nu$: One more hint for scalar leptoquarks? / Carvunis, Alexandre (Annecy, LAPTH) ; Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Guadagnoli, Diego (CERN ; Annecy, LAPTH) ; Gangal, Shireen (Annecy, LAPTH)
Experimental data have provided intriguing hints for the violation of lepton flavour universality (LFU), including $B\to D^{(*)}\tau\nu/B\to D^{(*)}\ell\nu$, the anomalous magnetic moment of the muon and $b\!\to\! s\ell^+\ell^-$ with a significance of $\!>3\,\sigma$, $>\!4\,\sigma$ and $>\!5\,\sigma$, respectively. Furthermore, in a recent re-analysis of 2018 Belle data, it was found that the forward-backward asymmetry ($\Delta A_{\rm FB}$) of $B \to D^{*}\mu\bar \nu$ vs $B\to D^{*}e\bar \nu$ disagrees with the SM prediction by $\approx\!\!4\,\sigma$, providing an additional sign of LFU violation. [...]
arXiv:2106.09610; CERN-TH-2021-092; LAPTH-020/21; PSI-PR-21-12; ZU-TH 27/21.- 2022-02-01 - 7 p. - Published in : Phys. Rev. D 105 (2022) L031701 Fulltext: PhysRevD.105.L031701 - PDF; 2106.09610 - PDF;

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(37)

Generic Tests of <math display="inline"><mi>C</mi><mi>P</mi></math> Violation in High-<math display="inline"><msub><mi>p</mi><mi>T</mi></msub></math> Multilepton Signals at the LHC and Beyond / Afik, Yoav (CERN) ; Bar-Shalom, Shaouly (Technion) ; Pal, Kuntal (UC, Riverside) ; Soni, Amarjit (Brookhaven) ; Wudka, Jose (UC, Riverside)
We introduce a modification to the standard expression for tree-level CP-violation in scattering processes at the LHC, which is important when the initial state in not self-conjugate. Based on that, we propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals. [...]
arXiv:2212.09433.- 2023-10-23 - 8 p. - Published in : Phys. Rev. Lett. 131 (2023) 171801 Fulltext: 2212.09433 - PDF; Publication - PDF;

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(37)

Third order correction to semileptonic $b\to u$ decay: fermionic contributions / Fael, Matteo (CERN) ; Usovitsch, Johann (CERN)
We present the QCD corrections of order $\alpha_s^3$ to the decay rate of $b \to u \ell \bar \nu_\ell$, with $\ell = e,\mu$, originating from diagrams with closed fermion loops and neglecting the mass of the up quark. Our calculation relies on integration-by-parts reduction of Feynman integrals with one propagator raised to a symbolic power in Kira and the numerical evaluation of master integrals with AMFlow. [...]
arXiv:2310.03685; CERN-TH-2023-181.- 2023-12-01 - 5 p. - Published in : Phys. Rev. D 108 (2023) 114026 Fulltext: 2310.03685 - PDF; Publication - PDF;

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