Examinando por Autor "Kovalenko, S."
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Ítem Constraining 3-3-1 models at the LHC and future hadron colliders(American Physical Society, 2022-09) Alves, A.; Duarte, L.; Kovalenko, S.; Oviedo-Torres, Y.M.; Queiroz, F.S.; Villamizar, Y.S.In this work, we derive lower mass bounds on the Z0 gauge boson based on the dilepton data from the Large Hadron Collider (LHC) with 13 TeV of center-of-mass energy, and forecast the sensitivity of the high-luminosity LHC with L ¼ 3000 fb−1, the high-energy LHC with ffiffi s p ¼ 27 TeV, and also at the Future Circular Collider with ffiffi s p ¼ 100 TeV. We take into account the presence of exotic and invisible decays of the Z0 gauge boson to find a more conservative and robust limit, different from previous studies. We investigate the impact of these new decay channels for several benchmark models in the scope of two different 3-3-1 models. We found that in the most constraining cases, LHC with 139 fb−1 can impose mZ0 > 4 TeV. Moreover, we forecast high-luminosity LHC, high-energy LHC, and Future Circular Collider reach, and derive the projected bounds mZ0 > 5.8 TeV, mZ0 > 9.9 TeV, and mZ0 > 27 TeV, respectively. Lastly, we put our findings into perspective with dark matter searches to show the region of parameter space where a dark matter candidate with the right relic density is possible.Ítem Dead or alive? Implications of the muon anomalous magnetic moment for 3-3-1 models(Elsevier B.V., 2020-10) de Jesus, A.S.; Kovalenko, S.; de S. Pires, C.A.; Queiroz, F.S.; Villamizar, Y.S.We have witnessed a persistent puzzling anomaly in the muon magnetic moment that cannot be accounted for in the Standard Model even considering the existing large hadronic uncertainties. A new measurement is forthcoming, and it might give rise to a 5σ claim for physics beyond the Standard Model. Motivated by it, we explore the implications of this new result to five models based on the SU(3)C×SU(3)L×U(1)N gauge symmetry and put our conclusions into perspective with LHC bounds. We show that previous conclusions found in the context of such models change if there are more than one heavy particle running in the loop. Moreover, having in mind the projected precision aimed by the g-2 experiment at FERMILAB, we place lower mass bounds on the particles that contribute to muon anomalous magnetic moment assuming the anomaly is otherwise resolved. Lastly, we discuss how these models could accommodate such anomaly in agreement with current bounds. © 2020 The Author(s) Learn about these TopicsÍtem Flavor changing interactions confronted with meson mixing and hadron colliders(American Physical Society, 2023-03) Cárcamo Hernández, A. E.; Duarte, L.; De Jesus, A.S.; Kovalenko, S.; Queiroz, F.S.; Siqueira, C.; Oviedo-Torres, Y.M.; Villamizar, Y.We have witnessed some flavor anomalies appearing in the past years, and explanations based on extended gauge sectors are among the most popular solutions. These beyond the Standard Model (SM) theories often assume flavor-changing interactions mediated by new vector bosons. Still, at the same time, they could yield deviations from the SM in the K0 − K¯ 0, D0 − D¯ 0, B0 d − B¯ 0 d, and B0 s − B¯ 0 s meson systems. Using up-to-date data on the mass difference of these meson systems, we derive lower mass bounds on vector mediators for two different parametrizations of the quark mixing matrices. Focusing on a well-motivated model based on the fundamental representation of the weak SU(3) gauge group, we put our findings into perspective with current and future hadron colliders to conclude that meson mass systems can give rise to bounds much more stringent than those from high-energy colliders and that recent new physics interpretations of the b → s and RðD Þ anomalies are disfavoredÍtem Lepton phenomenology of Stueckelberg portal to dark sector(American Physical Society, 2022-04) Kachanovich, A.; Kovalenko, S.; Kuleshov, S.; Lyubovitskij, V.; Zhevlakov, A.We propose an extension of the Standard Model (SM) with a UA′(1) gauge-invariant dark sector connected to the SM via a new portal - the Stueckelberg portal, arising in the framework of dark photon A′ mass generation via the Stueckelberg mechanism. This portal opens through the effective dim=5 operators constructed from the covariant term of the auxiliary Stueckelberg scalar field σ providing flavor nondiagonal renormalizable couplings of both σ and A′ to the SM fermions ψ. The Stueckelberg scalar plays a role of Goldstone boson in the generation of mass of the dark photon. Contrary to the conventional kinetic mixing portal, in our scenario, flavor diagonal A′-ψ couplings are not proportional to the fermion charges and are, in general, flavor nondiagonal. These features drastically change the phenomenology of dark photon A′ relaxing or avoiding some previously established experimental constraints. We focus on the phenomenology of the described scenario of the Stueckelberg portal in the lepton sector and analyze the contribution of the dark sector fields A′ to the anomalous magnetic moment of muon (g-2)μ, lepton flavor-violating decays li→lkγ, and μ-e conversion in nuclei. We obtain limits on the model parameters from the existing data on the corresponding observables.Ítem Quark condensate seesaw mechanism for neutrino mass(American Physical Society, 2021-01) Babič, A.; Kovalenko, S.; Krivoruchenko, M.I.; Šimkovic, F.We study a mechanism of generation of Majorana neutrino mass due to spontaneous breaking of chiral symmetry (SBCS) accompanied by the formation of a quark condensate. The effect of the condensate is transmitted to the neutrino sector via lepton-number violating (LNV) lepton-quark dimension-7 operators known in the literature as an origin of the neutrino-mass-independent mechanism of neutrinoless double-beta (0νββ) decay. The smallness of neutrino masses is due to a large ratio between the LNV scale and the scale of the SBCS. This is a new realization of the seesaw mechanism, which we dub the quark condensate seesaw (QCSS). We examine the predictions of the QCSS for 0νββ-decay and neutrino mass spectrum. We will show that our model predicts the normal neutrino mass ordering and narrow ranges of the neutrino masses. © 2021 authors.Ítem Scotogenic neutrino masses with gauged matter parity and gauge coupling unification(Springer Science and Business Media Deutschland GmbH, 2022-03) Cárcamo Hernández, A.; Hati, C.; Kovalenko, S.; Valle, J.; Vaquera-Araujo, C.Building up on previous work we propose a Dark Matter (DM) model with gauged matter parity and dynamical gauge coupling unification, driven by the same physics responsible for scotogenic neutrino mass generation. Our construction is based on the extended gauge group SU(3)c ⊗ SU(3)L ⊗ U(1)X ⊗ U(1)N, whose spontaneous breaking leaves a residual conserved matter parity, MP, stabilizing the DM particle candidates of the model. The key role is played by Majorana SU(3)L-octet leptons, allowing the successful gauge coupling unification and a one-loop scotogenic neutrino mass generation. Theoretical consistency allows for a plethora of new particles at the ≲ O(10) TeV scale, hence accessible to future collider and low-energy experiments.Ítem Sequentially loop suppressed fermion masses from a single discrete symmetry(Springer, 2020-06) Arbeláez, C.; Hernández, A.E.C.; Cepedello, R.; Kovalenko, S.; Schmidt, I.We propose a systematic and renormalizable sequential loop suppression mechanism to generate the hierarchy of the Standard Model fermion masses from one discrete symmetry. The discrete symmetry is sequentially softly broken in order to generate one-loop level masses for the bottom, charm, tau and muon leptons and two-loop level masses for the lightest Standard Model charged fermions. The tiny masses for the light active neutrinos are produced from radiative type-I seesaw mechanism, where the Dirac mass terms are effectively generated at two-loop level. © 2020, The Author(s).Ítem Vectorlike leptons and inert scalar triplet: Lepton flavor violation, g-2, and collider searches(American Physical Society, 2020-08) De Jesus, A.S.; Kovalenko, S.; Queiroz, F.S.; Siqueira, C.; Sinha, K.We investigate simplified models involving an inert scalar triplet and vectorlike leptons that can account for the muon g-2 anomaly. These simplified scenarios are embedded in a model that features W' and Z' bosons, which are subject to stringent collider bounds. The constraints coming from the muon g-2 anomaly are put into perspective with collider bounds, as well as bounds coming from lepton flavor violation searches. The region of parameter space that explains the g-2 anomaly is shown to be within reach of lepton flavor violation probes and future colliders such as HL-LHC and HE-LHC. © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.