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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Abstract
A dark leptophilic scalar (ϕL) is a hypothetical particle that couples only to leptons rather than quarks. We report on a search for ϕL in the e+e−→τ+τ−ϕL, ϕL→ℓ+ℓ−(ℓ=e,μ) process using 626 fb−1 of data collected by the Belle experiment near the ϒ(4S) 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 ϕL and leptons. Our bounds, obtained in a blinded approach, are 19% more constraining than the previous limits, averaged over the mass range 0.04≤mϕL≤6.5 GeV. We exclude the parameter space below 4 GeV favored by measurement of the anomalous magnetic moment of the muon. Published by the American Physical Society 2024
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