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Search for a dark leptophilic scalar produced in association with τ^+τ^- pair in e^+e^- annihilation at center-of-mass energies near 10.58 GeV
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Search for a dark leptophilic scalar produced in association with τ^+τ^- pair in e^+e^- annihilation at center-of-mass energies near 10.58 GeV
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A dark leptophilic scalar $(\phi_L)$ is a hypothetical particle that couples only to leptons rather than quarks. We report on a search for $\phi_L$ in the $e^+e^- \to \tau^+ \tau^- \phi_L, ~\phi_L \to \ell^+ \ell^- ~(\ell = e, \mu)$ process using 626~\invfb of data collected by the Belle experiment near the \Y4S resonance. We validate the backgrounds with multiple control regions in data, using a novel multiclass multivariate event classifier. In absence of a signal, we quote upper limits at the 90\% confidence level on the coupling between $\phi_L$ and leptons. Our bounds, obtained in a blinded approach, are 19\% more constraining than the previous limits, averaged over the mass range $0.04 \leq m_{\phi_L} \leq 6.5~\gev$. We exclude the parameter space below 4~\gev favored by measurement of the anomalous magnetic moment of the muon.
Forward citations
Cited by 2 Pith papers
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Muon-induced di-tau production as a probe of new physics
Proposal to use muon trident process with HEMERA detector on 10^18 TeV muons to extend B-factory and (g-2)μ bounds on leptophilic scalar couplings by over an order of magnitude.
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Constraints on a Light Leptophilic Scalar from Dark-Sector Couplings
A parameter space analysis of a leptophilic scalar mediator model for Majorana dark matter yields a viable sub-GeV region after applying relic density, cosmological, astrophysical, and laboratory constraints.
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