Flavor-changing top quark rare decays in the Bestest Little Higgs Model

T. Cisneros-Pérez; M. A. Hernández-Ruíz; A. Gutiérrez-Rodríguez; E. Cruz-Albaro

doi:10.1140/epjc/s10052-023-12264-6

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 1093
https://doi.org/10.1140/epjc/s10052-023-12264-6

Regular Article - Theoretical Physics

Flavor-changing top quark rare decays in the Bestest Little Higgs Model

T. Cisneros-Pérez¹^a, M. A. Hernández-Ruíz¹, A. Gutiérrez-Rodríguez² and E. Cruz-Albaro²

¹ Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Apartado Postal C-585, 98060, Zacatecas, Mexico
² Facultad de Física, Universidad Autónoma de Zacatecas, Apartado Postal C-580, 98060, Zacatecas, Mexico

^a tzihue@gmail.com

Received: 31 July 2023
Accepted: 19 November 2023
Published online: 30 November 2023

Abstract

This paper investigates rare flavor-changing decays of the top quark in the Bestest Little Higgs Model (BLHM). As a result, flavor-changing phenomena are introduced in the BLHM for the first time. In this study, we incorporate new flavor mixing terms between the light quarks of the Standard Model (SM) and the fermions and bosons of the BLHM. We compute the one-loop contributions from the heavy quark (B) and the heavy bosons $(W^{' \pm}, ϕ^{\pm}, η^{\pm}, H^{\pm})$ $(W^{\prime \pm }, \phi ^{\pm }, \eta ^{\pm },H^{\pm })$ . Our findings demonstrate that the branching ratios of decays $t \to q V$ $t\rightarrow qV$ and $t \to q h^{0}$ $t\rightarrow qh^0$ , where $q = u, c$ $$q=u,c$$ and $V = Z, γ, g$ $V=Z, \gamma , g$ , can reach larger branching ratios compared to their counterparts in the SM, except for the gluon case. Moreover, we observe that the processes with the highest sensitivity are $B r (t \to c Z) \sim 10^{- 5}$ $Br(t\rightarrow cZ)\sim 10^{-5}$ , $B r (t \to c γ) \sim 10^{- 6}$ $Br(t\rightarrow c\gamma )\sim 10^{-6}$ and $B r (t \to c h^{0}) \sim 10^{- 8}$ $Br(t \rightarrow ch^0) \sim 10^{-8}$ within the appropriate parameter space.

© The Author(s) 2023

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