Examinando por Autor "de Jesus, A.S."

Mostrando 1 - 2 de 2
  • Miniatura
    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 Topics
  • No hay miniatura disponible
    Ítem
    Search for dark sector by repurposing the UVX Brazilian synchrotron
    (Institute for Ionics, 2023-06) Duarte, L.; Lin, L.; Lindner, M.; Kozhuharov, V.; Kuleshov, S.V.; de Jesus, A.S.; Queiroz, F.S.; Villamizar, Y.; Westfahl, H., Jr.
    We propose the first Search for Dark Sector at the Brazilian Synchrotron Light Laboratory, site of Sirius, a fourth-generation storage ring. We show that UVX, Sirius predecessor, can be a promising dark sector detector, SeDS, with unprecedented sensitivity. The search is based on a 1 - 3 GeV positron beam impinging on a thick target leading the e+e-→ γA′ reaction, followed by a missing mass spectrum event reconstruction. We show that SeDS has the potential to probe dark photons with masses up to 55 MeV and kinetic coupling down to ϵ2∼ 10 - 12 . Therefore, such experiment would constitute the best dark photon probe worldwide in the 10 - 55 MeV mass range, being able to probe an unexplored region of parameter space.