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Search for a Higgs portal scalar decaying to electron-positron pairs in the MicroBooNE detector

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Article number151803
<mark>Journal publication date</mark>8/10/2021
<mark>Journal</mark>Physical review letters
Issue number15
Number of pages8
Publication StatusPublished
Early online date6/10/21
<mark>Original language</mark>English


We present a search for the decays of a neutral scalar boson produced by kaons decaying at rest, in the context of the Higgs portal model, using the MicroBooNE detector. We analyze data triggered in time with the Fermilab NuMI neutrino beam spill, with an exposure of $1.93\times10^{20}$ protons on target. We look for monoenergetic scalars that come from the direction of the NuMI hadron absorber, at a distance of 100 m from the detector, and decay to electron-positron pairs. We observe one candidate event, with a Standard Model background prediction of $1.9\pm0.8$. We set an upper limit on the scalar-Higgs mixing angle of $\theta

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© 2021 American Physical Society