Výsledky vyhledávání - "Luís Lavoura"

Akademický článek

Unitarity constraints on large multiplets of arbitrary gauge groups

Publikováno v: Nuclear Physics B, Vol 1004, Iss , Pp 116542- (2024)

We impose partial-wave unitarity on 2→2 tree-level scattering processes to derive constraints on the dimensions of large scalar and fermionic multiplets of arbitrary gauge groups. We apply our results to scalar and fermionic extensions of the Stand

Externí odkaz: https://doaj.org/article/a87f3b5370a144ab8a92e8fe3c5a9985

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Akademický článek

Oblique corrections from leptoquarks

Autor: Francisco Albergaria, Luís Lavoura

Publikováno v: Journal of High Energy Physics, Vol 2023, Iss 9, Pp 1-26 (2023)

Abstract We present general formulas for the oblique-correction parameters S, T, U, V, W, and X in a model of New Physics having arbitrary numbers of scalar leptoquarks of the five permissible types. We allow for a general mixing among the scalars of

Externí odkaz: https://doaj.org/article/c0f8157acdc1429a879b2c4bbe415d95

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Akademický článek

Oblique corrections from triplet quarks

Autor: Francisco Albergaria, Luís Lavoura, Jorge C. Romão

Publikováno v: Journal of High Energy Physics, Vol 2023, Iss 3, Pp 1-25 (2023)

Abstract We present general formulas for the oblique-correction parameters S, T , U , V, W, and X in an extension of the Standard Model having arbitrary numbers of singlet, doublet, and triplet quarks with electric charges −4/3, −1/3, 2/3, and 5/

Externí odkaz: https://doaj.org/article/57fbf5a58c90437dbe86530b510ad9a7

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Akademický článek

The Zbb¯ vertex in a left–right model

Autor: Duarte Fontes, Darius Jurčiukonis, Luís Lavoura

Publikováno v: Nuclear Physics B, Vol 996, Iss , Pp 116373- (2023)

We consider the one-loop corrections to the Zbb¯ vertex in a CP-conserving left–right model (LRM), viz. a model with gauge group SU(2)L×SU(2)R×U(1). We allow the gauge coupling constants of SU(2)L and SU(2)R to be different. The spontaneous symm

Externí odkaz: https://doaj.org/article/8c5f62f590ed40639ee1fa28cc6adca3

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Akademický článek

Two-body lepton-flavour-violating decays in a 2HDM with soft family-lepton-number breaking

Autor: Darius Jurčiukonis, Luís Lavoura

Publikováno v: Journal of High Energy Physics, Vol 2022, Iss 3, Pp 1-54 (2022)

Abstract We evaluate the decays ℓ 1 ± $$ {\ell}_1^{\pm } $$ → ℓ 2 ± γ $$ {\ell}_2^{\pm}\gamma $$ , Z → ℓ 1 + ℓ 2 − $$ {\ell}_1^{+}{\ell}_2^{-} $$ , and h → ℓ 1 + ℓ 2 − $$ {\ell}_1^{+}{\ell}_2^{-} $$ , where ℓ 1 and ℓ 2 ar

Externí odkaz: https://doaj.org/article/35097e32427f4824848fb8393daed631

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Akademický článek

Fitting the Zb b ¯ $$ Zb\overline{b} $$ vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model

Autor: Darius Jurčiukonis, Luís Lavoura

Publikováno v: Journal of High Energy Physics, Vol 2021, Iss 7, Pp 1-30 (2021)

Abstract We investigate the new contributions to the parameters g L and g R of the Zb b ¯ $$ Zb\overline{b} $$ vertex in a multi-Higgs-doublet model (MHDM). We emphasize that those contributions generally worsen the fit of those parameters to the ex

Externí odkaz: https://doaj.org/article/a93bd54633794ba18cd9c2da157d8cd1

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Akademický článek

More models for lepton mixing with four constraints

Autor: Darius Jurčiukonis, Luís Lavoura

Publikováno v: Journal of High Energy Physics, Vol 2019, Iss 7, Pp 1-25 (2019)

Abstract We propose new lepton-mixing textures that may be enforced through well-defined symmetries in renormalizable models. Each of our textures has four sum rules for the neutrino mass observables. The models are based on the type-I seesaw mechani

Externí odkaz: https://doaj.org/article/52ec4822d81c465bb384df5a58126b6a

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Akademický článek

One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets

Autor: Duarte Fontes, Luís Lavoura, Jorge C. Romão, João P. Silva

Publikováno v: Nuclear Physics B, Vol 958, Iss , Pp 115131- (2020)

We study the one-loop corrections to the Zbb¯ vertex in extensions of the Standard Model with arbitrary numbers of scalar doublets, neutral scalar singlets, and charged scalar singlets. Starting with a general parameterization of theories with neutr

Externí odkaz: https://doaj.org/article/eeb36851ca8549658c963524d641edee

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Akademický článek

Lepton mixing and the charged-lepton mass ratios

Autor: Darius Jurčiukonis, Luís Lavoura

Publikováno v: Journal of High Energy Physics, Vol 2018, Iss 3, Pp 1-30 (2018)

Abstract We construct a class of renormalizable models for lepton mixing that generate predictions given in terms of the charged-lepton mass ratios. We show that one of those models leads, when one takes into account the known experimental values, to

Externí odkaz: https://doaj.org/article/83cfa7f99af7495f8687e99e8d095a8f

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Radiative seesaw corrections and charged-lepton decays in a model with soft flavour violation

Autor: Luís Lavoura, Pedro M. Ferreira, E.H. Aeikens, Darius Jurčiukonis, Walter Grimus

Publikováno v: Journal of High Energy Physics, Vol 2020, Iss 12, Pp 1-28 (2020)
Journal of high energy physics, New York : Springer, 2020, vol. 12, p. [1-29]
Journal of High Energy Physics
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

We consider the one-loop radiative corrections to the light-neutrino mass matrix and their consequences for the predicted branching ratios of the five lepton-flavour-violating decays $\ell_1^- \to \ell_2^- \ell_3^+ \ell_3^-$ in a two-Higgs-doublet mo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5463de645f972dc3c493598f6a39e310
https://doaj.org/article/c7887eb2218c4eb48d16a6240b7e98a0

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