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Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector
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MicroBooNE Collaboration (Including:
). (2022) Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector. Physical Review D (Particles, Fields, Gravitation and Cosmology), 106 (9). 092006. doi:10.1103/PhysRevD.106.092006 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.106.092006
Abstract
We present a search for long-lived Higgs portal scalars (HPS) and heavy neutral leptons (HNL) decaying in the MicroBooNE liquid-argon time projection chamber. The measurement is performed using data collected synchronously with the neutrino beam from Fermilab’s Main Injector with a total exposure corresponding to 7.01×1020 protons on target. We set upper limits at the 90% confidence level on the mixing parameter |Uμ4|2 ranging from |Uμ4|2<12.9×10−8 for Majorana HNLs with a mass of mHNL=246 MeV to |Uμ4|2<0.92×10−8 for mHNL=385 MeV, assuming |Ue4|2=|Uτ4|2=0 and HNL decays into μ±π∓ pairs. These limits on |Uμ4|2 represent an order of magnitude improvement in sensitivity compared to the previous MicroBooNE result. We also constrain the scalar-Higgs mixing angle θ by searching for HPS decays into μ+μ− final states, excluding a contour in the parameter space with lower bounds of θ2<31.3×10−9 for mHPS=212 GeV and θ2<1.09×10−9 for mHPS=275 GeV. These are the first constraints on the scalar-Higgs mixing angle θ from a dedicated experimental search in this mass range.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Higgs bosons, Leptons (Nuclear physics), Particles (Nuclear physics), Neutrinos | |||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | |||||||||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||||||||
ISSN: | 1550-7998 | |||||||||||||||||||||||||||
Official Date: | 28 November 2022 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 106 | |||||||||||||||||||||||||||
Number: | 9 | |||||||||||||||||||||||||||
Number of Pages: | 19 | |||||||||||||||||||||||||||
Article Number: | 092006 | |||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevD.106.092006 | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||
Date of first compliant deposit: | 4 January 2023 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 4 January 2023 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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