arXiv subjects

D. Espinosa-Gómez

Publications and source records attributed to D. Espinosa-Gómez.

5 recordsLinked to original sources

arXiv2026

Production of the top partner $T$ of the Bestest Little Higgs Model at the future muon collider

In this work, we evaluate the decay widths and branching ratios of the heavy top partner $T$, and perform a comprehensive phenomenological study of its pair and associated production at a muon collider within the framework of the Bestest Little Higgs Model (BLHM). The BLHM provides an attractive and natural mechanism for addressing the fine-tuning problem in the Standard Model (SM) of particle physics. In our study of the top partner $T$, we consider the production processes $μ^{+} μ^{-} \to (γ, Z, Z', h, H) \to T \bar{T}$ and $μ^{+} μ^{-} \to (γ, Z, Z', h, H)\to \bar{t}T+ t \bar{T}$, and we explore different center-of-mass energies of the muon collider to perform our numerical analysis of the production cross sections for the processes of interest. Our results show that pair production is the most promising channel for probing the top partner of the BLHM at a future muon collider.

hep-ph↗

arXiv2025

Search for pseudoscalar Higgs boson $A_0$ of the Bestest Little Higgs model at the LHC and FCC-hh

We analyse the sensitivity of the Large Hadron Collider (LHC) and the Future Circular Collider-hadron-hadron (FCC-hh) to the existence of pseudoscalar Higgs boson $A_0$ predicted by the Bestest Little Higgs model. We study the tree-level (two and three body) and one-loop decays of the pseudoscalar, $A_0 \to b\bar b, t \bar t, γt\bar t, γb \bar b, Zt\bar t, Zb \bar b, Wt\bar b, h_0 t \bar t, h_0 b \bar b$, and $A_0 \to γγ, γZ, ZZ, gg, WW$, respectively. In addition, we perform a phenomenological study of the production of the pseudoscalar $A_0$ via gluon fusion $gg \to A_0 \to Y$ processes, where $Y \equiv γγ, γZ, ZZ, gg, WW$. From the cross section of the processes of interest and the expected integrated luminosity of the LHC and FCC-hh, we determined the number of events that could be produced in both colliders.

hep-ph↗

arXiv2024

New physics search with the new gauge boson $Z'$ of the bestest little Higgs model at the muon collider

The Bestest Little Higgs Model (BLHM) has attracted increasing attention in recent years, mainly because it can explain the hierarchy problem without fine-tuning by introducing one-loop corrections to the Higgs boson mass through heavy top quark partners and heavy gauge bosons. In the context of this new model, we exhaustively investigated the impact of the BLHM parameters on the Higgs-strahlung production processes $μ^{-} μ^{+} \to Z'h_0$ and $μ^{-} μ^{+} \to Z'H_0$, where $Z'$ and $H_0$ represent a new heavy gauge boson and a new heavy Higgs boson, respectively. We consider the integrated luminosities of ${\cal L}=2000, 20 000$ ${\rm fb^{-1}}$ and the respective center-of-mass energies of $\sqrt{s}=3000, 10 000$ GeV projected for a future muon collider to estimate the number of expected Higgs boson production events $h_0$ or $H_0$ in association with a new gauge boson $Z'$ at the muon collider. In addition, we derive and present the Feynman rules for scalars ($h_0, H_0, ϕ^{0}, η^{0}, σ, H^{\pm}, ϕ^{\pm}, η^{\pm}, A_0$) and include the self-interactions of Higgs bosons.

hep-ph↗

arXiv2024

Probing the heavy Higgs boson production and decay $H_0$ of the Bestest Little Higgs Model at the LHC and the FCC-hh

In the Bestest Little Higgs Model (BLHM) scenario, we analyze the branching ratios and production cross-section of the heavy Higgs boson $H_0$. The analysis is performed at the tree level and the one-loop level. In addition, we present results of the possible production of the heavy Higgs boson $H_0$ via gluon fusion for the center-of-mass energies and the integrated luminosities of the LHC, HE-LHC, HL-LHC, and FCC-hh. Our results show a very optimistic scenario for studying the $H_0$ scalar predicted by the BLHM and for the energies and luminosities of current and future hadron colliders.

hep-ph↗

arXiv2017

Heavy neutral pseudoscalar decays into gauge bosons in the Littlest Higgs Model

We study two-body decays of a new neutral pseudoscalar into gauge bosons within the context of the Littlest Higgs model. Concretely, the $Φ^P \to WW, VV, gg$ processes induced at the one-loop level, with $V=γ, Z$, are considered. Since the branching ratios of the $Φ^P \to VV$ decays result very suppressed, only the $Φ^P \to WW, gg$ processes are thoroughly studied. The branching ratios for the $Φ^P \to gg$ and $Φ^P \to WW$ decays are of the order of $10^{-4}$ and $10^{-6}$, respectively, for $f$ around 2 TeV, which represents the global symmetry breaking scale of the theory. The production cross section of the $Φ^P$ boson via gluon fusion at LHC is estimated.

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