Search for a dark leptophilic scalar produced in association with <math display="inline"><msup><mi>τ</mi><mo>+</mo></msup><msup><mi>τ</mi><mo>-</mo></msup></math> pair in <math display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>-</mo></mrow></msup></mrow></math> annihilation at center-of-mass energies near 10.58 GeV

Biswas, D.; Banerjee, Sw.; Adachi, I.; Aihara, H.; Asner, D.M.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; Bennett, J.

doi:10.1103/PhysRevD.109.032002

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

Belle

Collaboration

•

D. Biswas

Jul 15, 2022

8 pages

Published in:

Phys.Rev.D 109 (2024) 3, 032002

Published: Feb 1, 2024

e-Print:

2207.07476 [hep-ex]

DOI:

10.1103/PhysRevD.109.032002 (publication)

Report number:

BELLE-CONF-2201,
Belle Preprint 2023-13,
KEK Preprint 2023-17

Experiments:

KEK-BF-BELLE

View in:

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Abstract: (APS)

A dark leptophilic scalar

(ϕ_{L})

is a hypothetical particle that couples only to leptons rather than quarks. We report on a search for

ϕ_{L}

in the

e^{+} e^{-} \to τ^{+} τ^{-} ϕ_{L}

,

ϕ_{L} \to ℓ^{+} ℓ^{-} (ℓ = e, μ)

process using

626 {fb}^{- 1}

of data collected by the Belle experiment near the

ϒ (4 S)

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

ϕ_{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_{ϕ_{L}} \leq 6.5 GeV

. We exclude the parameter space below 4 GeV favored by measurement of the anomalous magnetic moment of the muon.

Note:

8 pages, 7 figures

electron positron: annihilation
electron positron: colliding beams
tau: pair production
dark matter: associated production
muon: magnetic moment
mass: scale
magnetic moment: anomaly
lepton: coupling: high
coupling constant: upper limit
BELLE

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