Search for a Dark Photon and an Invisible Dark Higgs Boson in <math display="inline"><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> and Missing Energy Final States with the Belle II Experiment - INSPIRE

DataBETA

Search for a Dark Photon and an Invisible Dark Higgs Boson in $μ^{+} μ^{-}$ and Missing Energy Final States with the Belle II Experiment

Belle-II

Collaboration

Jul 1, 2022

12 pages

Published in:

Phys.Rev.Lett. 130 (2023) 7, 071804

Published: Feb 17, 2023

e-Print:

2207.00509 [hep-ex]

DOI:

10.1103/PhysRevLett.130.071804 (publication)

PDG: Hidden Photons: Kinetic Mixing Parameter Limits

Report number:

Belle II Preprint 2022-001,
KEK Preprint 2022-6

Experiments:

KEK-BF-BELLE-II

View in:

ADS Abstract Service

reference search22 citations

Citations per year

Abstract: (APS)

The dark photon

A^{'}

and the dark Higgs boson

h^{'}

are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of

A^{'}

and

h^{'}

in the dark Higgsstrahlung process

e^{+} e^{-} \to A^{'} h^{'}

with

A^{'} \to μ^{+} μ^{-}

and

h^{'}

invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV in data collected by the Belle II experiment in 2019. With an integrated luminosity of

8.34 {fb}^{- 1}

, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7–5.0 fb on the cross section and in the range of

1.7 \times 10^{- 8} - 200 \times 10^{- 8}

on the effective coupling

ϵ^{2} \times α_{D}

for the

A^{'}

mass in the range of

4.0 GeV / c^{2} < M_{A^{'}} < 9.7 GeV / c^{2}

and for the

h^{'}

mass

M_{h^{'}} < M_{A^{'}}

, where

ϵ

is the mixing strength between the standard model and the dark photon and

α_{D}

is the coupling of the dark photon to the dark Higgs boson. Our limits are the first in this mass range.

Note:

Accepted for publication in Physical Review Letters

electron positron: annihilation
electron positron: colliding beams
photon: hidden sector
Higgs particle
muon: pair production
dilepton: final state
BELLE
KEK-B
missing-energy
statistical analysis: Bayesian

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Figures(4)

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