Searching for LFV Flavon decays at hadron colliders

Abstract

The search for Flavons with a mass of $\mathcal{O}$(1) TeV at current and future colliders might probe low-scale flavor models. We are interested in the simplest model that invokes the Froggatt-Nielsen (FN) mechanism with an Abelian flavor symmetry, which includes a Higgs doublet and a FN complex singlet. Assuming a CP conserving scalar potential, there are a $CP$-even $H_F$ and a $CP$-odd $A_F$ Flavons with lepton flavor violating (LFV) couplings. The former can mix with the standard-model-like Higgs boson, thereby inducing tree-level LFV Higgs interactions that may be at the reach of the LHC. We study the constraints on the parameter space of the model from low-energy LFV processes, which are then used to evaluate the Flavon decay widths and the $gg\to \varphi \to \tau \mu$ ($\varphi =H_F,A_F$) production cross section at hadron colliders. After imposing several kinematic cuts to reduce the SM main background, we find that for $m_{H_F}$ about 200-350 GeV, the decay $H_F\to \tau \mu$ might be at the reach of the LHC for a luminosity in the range 1-3 ab${}^{-1}$, however, a luminosity of the order of 10 ab${}^{-1}$ would be required to detect the $A_F\to \tau \mu$ decay. On the other hand a future 100 TeV $pp$ collider could probe masses as high as $\mathcal{O}$(10) TeV if it reaches an integrated luminosity of at least 20 ab${}^{-1}$. Therefore, the 100 TeV Collider could work as a Flavon factory.

22 pages, 17 Figures,4 Tables. Version to be published in PRD

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Cited by in corpus (7)

• Collider Constraints on Lepton Flavor Violation in the 2HDM
• Flavour bounds on the flavon of a minimal and a non-minimal ${\mathcal{Z}}_2\times {\mathcal{Z}}_N$ symmetry
• Constraining $A_4$ Leptonic Flavour Model Parameters at Colliders and Beyond
• Finding flavons at colliders
• The General One-loop Structure for the LFV Higgs Decays $H_r\to l_a{l}_b$ in multi-Higgs Models with Neutrino Masses
• Flavor changing Flavon decay $\varphi \to tc$ ($\varphi =H_F,A_F$) at the High Luminosity Large Hadron Collider
• Lessons from LHC on the LFV Higgs decays $h\to {\ell }_a{\ell }_b$ in the Two-Higgs Doublet Models