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.
Original language | English |
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Article number | 032002 |
Journal | Physical Review D |
Volume | 109 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2024 Feb 1 |
Bibliographical note
Publisher Copyright:© 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
ASJC Scopus subject areas
- Nuclear and High Energy Physics