scholarly journals Generalized 2HDM with wrong-sign lepton-Yukawa coupling, in light of $$g_{\mu }-2$$ and lepton flavor violation at the future LHC

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Nivedita Ghosh ◽  
Jayita Lahiri
Keyword(s):  
Parameter Space ◽  
Yukawa Coupling ◽  
Higgs Doublet ◽  
Lepton Flavor Violation ◽  
Model Parameter ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Artificial Neural Network Analysis ◽  
Two Higgs Doublet Model ◽  
Wrong Sign

AbstractTo explain the observed muon anomaly and simultaneously evade bounds from lepton flavor violation in the same model parameter space is a long-cherished dream. In view of a generalized Two Higgs Doublet Model, with a Yukawa structure as a perturbation of Type-X, we are able to get substantial parameter space satisfying these criteria. In this work, we focus on a region with “wrong-sign” lepton-Yukawa coupling which gives rise to interesting phenomenological consequences. Performing a simple cut-based analysis, we show that at 14 TeV run of the LHC with $$300 \mathrm{{fb}}^{-1}$$ 300 fb - 1 integrated luminosity, part of the model parameter space can be probed with significance "Equation missing" which further improves with Artificial Neural Network analysis.

scholarly journals LEPTON-FLAVOR-VIOLATING τ DECAYS IN TWO-HIGGS-DOUBLET MODEL III

2010 ◽  
Vol 25 (25) ◽  
pp. 4827-4837 ◽  
Author(s):  
WEN-JUN LI ◽  
YING-YING FAN ◽  
LIN-XIA LÜ ◽  
SU-ZHI GAO ◽  
GONG-WEI LIU
Keyword(s):  
Perturbation Theory ◽  
Parameter Space ◽  
Chiral Perturbation Theory ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Chiral Perturbation ◽  
Model Parameter ◽  
Lepton Flavor ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We study the lepton-flavor-violating processes of τ- → μ-PP decays with PP = K+K-, [Formula: see text], π+π-, π0π0 in the framework of two-Higgs-doublet model III by virtue of the chiral perturbation theory. In this model, only three neutral Higgs bosons contribute to these decays. With the current experimental constraints, we show that (a) the contributions of the |λuu(dd)| term are very small for these four decays; (b) we get the correlation between |λss| and |λτμ|; for |λτμ| ~ 10–400, one has |λss| ~ 40–1; (c) in the existing model parameter space, Br (τ- → μ- K+K-) could reach the order of [Formula: see text], but Br (τ → μ-π+π-/π0π0) are too small to be observed.

scholarly journals Muon $$g-2$$ anomaly and $$\mu $$–$$\tau $$-philic Higgs doublet with a light CP-even component

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Hong-Xin Wang ◽  
Lei Wang ◽  
Yang Zhang
Keyword(s):  
Confidence Level ◽  
Higgs Doublet ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Lepton Flavour

AbstractWe examine the possibilities of accommodating the muon $$g-2$$ g - 2 anomaly released by Fermilab in the 2HDM with a discrete $$Z_4$$ Z 4 symmetry in which an inert Higgs doublet field ($$H,~A,~H^\pm $$ H , A , H ± ) has the lepton flavor violation $$\mu $$ μ –$$\tau $$ τ interactions. We assume the Yukawa matrices to be real and symmetrical and investigate the case of light H (5 GeV $$<m_H<$$ < m H < 115 GeV). After imposing relevant theoretical and experimental constraints, especially for the multi-lepton searches at the LHC, we find that the muon $$g-2$$ g - 2 anomaly can be explained within $$2\sigma $$ 2 σ confidence level in the region of 5 GeV $$<m_H<20$$ < m H < 20  GeV, 130 GeV $$< m_A~(m_{H^\pm })<$$ < m A ( m H ± ) < 610 GeV, and 0.005 $$<\rho<$$ < ρ < 0.014. Meanwhile, the $$\chi ^2_\tau $$ χ τ 2 fitting the data of lepton flavour universality in the $$\tau $$ τ decays approaches to the SM prediction.

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