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Title: Search for a Dark Leptophilic Scalar in e(+) e(-) Collisions
Author: Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Model estàndard (Física nuclear)
Mètode de Montecarlo
Standard model (Nuclear physics)
Monte Carlo method
Issue Date: 28-Oct-2020
Publisher: American Physical Society
Abstract: Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e+e− collider, such a leptophilic scalar (ϕL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e+e−→τ+τ−ϕL, ϕL→ℓ+ℓ− (ℓ=e, μ) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the ϕL coupling to leptons in the range 0.04<mϕL<7.0  GeV. These bounds significantly improve upon the current constraints, excluding almost entirely the parameter space favored by the observed discrepancy in the muon anomalous magnetic moment below 4 GeV at 90% confidence level.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2020, vol. 125, num. 18, p. 181801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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