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A dark leptophilic scalar $(\phi_L)$ is a hypothetical particle from the darksector, that couples only to leptons rather than quarks. In the \mev to the\gev range, such particles are weakly constrained by direct detectionexperiments. We report on a search for $\phi_L$ in $e^+e^- \to \tau^+ \tau^-\phi_L, ~\phi_L \to \ell^+ \ell^- ~(\ell = e, \mu)$ process using 626 fb$^{-1}$of data collected by the Belle experiment near the $\Upsilon(4S)$ resonance. Wevalidate the backgrounds with multiple control regions in data, using a novelmulticlass multivariate event classifier. In absence of signal in the $\phi_L$mass range $0.04~Gev \leq m_{\phi_{L}} \leq 6.5~Gev$, we quote frequentistlimits on the coupling between $\phi_L$ and leptons, where nuisance parametersdescribing the systematic variations are obtained from data. Our bounds,obtained in a blinded approach, are comparable to the Bayesian limits obtainedby the BABAR experiment, and exclude the parameter space below $4~GeV$ favoredby measurement of the anomalous magnetic moment of the muon.

Search for a dark leptophilic scalar produced in association with  $\tau^+\tau^-$ pair in $e^+e^-$ annihilation at center-of-mass energies near  10.58 GeV