$(g-2{)}_{e,\mu }$ and strongly interacting dark matter with collider implications

Abstract

The quest for new physics beyond the Standard Model is boosted by the recently observed deviation in the anomalous magnetic moments of muon and electron from their respective theoretical prediction. In the present work, we have proposed a suitable extension of the minimal $L_{\mu }-L_{\tau }$ model to address these two experimental results as the minimal model is unable to provide any realistic solution. In our model, a new Yukawa interaction involving first generation of leptons, a singlet vector like fermion (${\chi }^{\pm }$) and a scalar (either an SU(2)${}_L$ doublet ${\Phi }_2^{\prime }$ or a complex singlet ${\Phi }_4^{\prime }$) provides the additional one loop contribution to $a_e$ only on top of the usual contribution coming from the $L_{\mu }-L_{\tau }$ gauge boson ($Z_{\mu \tau }$) to both electron and muon. The judicious choice of $L_{\mu }-L_{\tau }$ charges to these new fields results in a strongly interacting scalar dark matter in $\mathcal{O}(\mathrm{MeV})$ range after taking into account the bounds from relic density, unitarity and self interaction. The freeze-out dynamics of dark matter is greatly influenced by $3\to 2$ scatterings while the kinetic equilibrium with the SM bath is ensured by $2\to 2$ scatterings with neutrinos where $Z_{\mu \tau }$ plays a pivotal role. The detection of dark matter is possible directly through scatterings with nuclei mediated by the SM $Z$ bosons. Moreover, our proposed model can also be tested in the upcoming $e^{+}{e}^{-}$ colliders by searching opposite sign di-electron and missing energy signal i.e. $e^{+}{e}^{-}\to {\chi }^{+}{\chi }^{-}\to e^{+}{e}^{-}{\cancel{E}}_T$ at the final state.

arXiv comment54 pages, 7 Tables, 16 figures, new experimental constraints added, a new table including benchmark points added, results remain unchanged, version published in JHEP

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