Search for the dark photon and the dark Higgs boson at Belle
The Belle Collaboration

TL;DR
This study searches for dark photon and dark Higgs boson particles at Belle, setting new limits on their properties and interactions, but finds no evidence of their existence within the explored mass ranges.
Contribution
First comprehensive search for dark photon and dark Higgs boson at Belle covering wider mass ranges with improved limits and first constraints on certain final states.
Findings
No significant dark photon or dark Higgs signal observed.
Set new upper limits on production cross sections and coupling parameters.
First experimental constraints on the $3(\pi^+\pi^-)$ and $2(e^+e^-)X$ final states.
Abstract
The dark photon, , and the dark Higgs boson, , are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgs-strahlung channel, , with . We investigate ten exclusive final-states with , , or , in the mass ranges ~GeV/~~GeV/ and ~GeV/~~GeV/. We also investigate three inclusive final-states, , , and , where denotes a dark photon candidate detected via missing mass, in the mass ranges ~GeV/~~GeV/ and ~GeV/~~GeV/. Using the entire…
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