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Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector

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Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector. / MicroBooNE Collaboration ; Blake, A.; Devitt, A. et al.
In: Physical Review D, Vol. 106, No. 9, 092006, 28.11.2022.

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MicroBooNE Collaboration, Blake A, Devitt A, Nowak J, Patel N, Thorpe C. Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector. Physical Review D. 2022 Nov 28;106(9):092006. doi: 10.1103/PhysRevD.106.092006

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@article{fdca97af75ac4ca5ada548bbd5deac01,
title = "Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector",
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.",
keywords = "hep-ex",
author = "{MicroBooNE Collaboration} and P. Abratenko and J. Anthony and L. Arellano and J. Asaadi and A. Ashkenazi and S. Balasubramanian and B. Baller and C. Barnes and G. Barr and J. Barrow and V. Basque and L. Bathe-Peters and Rodrigues, {O. Benevides} and S. Berkman and A. Bhanderi and M. Bhattacharya and M. Bishai and A. Blake and B. Bogart and T. Bolton and Book, {J. Y.} and L. Camilleri and D. Caratelli and Terrazas, {I. Caro} and F. Cavanna and G. Cerati and Y. Chen and Conrad, {J. M.} and M. Convery and L. Cooper-Troendle and Crespo-Anadon, {J. I.} and Tutto, {M. Del} and Dennis, {S. R.} and P. Detje and A. Devitt and R. Diurba and R. Dorrill and K. Duffy and S. Dytman and B. Eberly and A. Ereditato and Evans, {J. J.} and R. Fine and Finnerud, {O. G.} and Fleming, {B. T.} and N. Foppiani and J. Nowak and N. Patel and C. Thorpe",
year = "2022",
month = nov,
day = "28",
doi = "10.1103/PhysRevD.106.092006",
language = "English",
volume = "106",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "American Physical Society",
number = "9",

}

RIS

TY - JOUR

T1 - Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector

AU - MicroBooNE Collaboration

AU - Abratenko, P.

AU - Anthony, J.

AU - Arellano, L.

AU - Asaadi, J.

AU - Ashkenazi, A.

AU - Balasubramanian, S.

AU - Baller, B.

AU - Barnes, C.

AU - Barr, G.

AU - Barrow, J.

AU - Basque, V.

AU - Bathe-Peters, L.

AU - Rodrigues, O. Benevides

AU - Berkman, S.

AU - Bhanderi, A.

AU - Bhattacharya, M.

AU - Bishai, M.

AU - Blake, A.

AU - Bogart, B.

AU - Bolton, T.

AU - Book, J. Y.

AU - Camilleri, L.

AU - Caratelli, D.

AU - Terrazas, I. Caro

AU - Cavanna, F.

AU - Cerati, G.

AU - Chen, Y.

AU - Conrad, J. M.

AU - Convery, M.

AU - Cooper-Troendle, L.

AU - Crespo-Anadon, J. I.

AU - Tutto, M. Del

AU - Dennis, S. R.

AU - Detje, P.

AU - Devitt, A.

AU - Diurba, R.

AU - Dorrill, R.

AU - Duffy, K.

AU - Dytman, S.

AU - Eberly, B.

AU - Ereditato, A.

AU - Evans, J. J.

AU - Fine, R.

AU - Finnerud, O. G.

AU - Fleming, B. T.

AU - Foppiani, N.

AU - Nowak, J.

AU - Patel, N.

AU - Thorpe, C.

PY - 2022/11/28

Y1 - 2022/11/28

N2 - 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.

AB - 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.

KW - hep-ex

U2 - 10.1103/PhysRevD.106.092006

DO - 10.1103/PhysRevD.106.092006

M3 - Journal article

VL - 106

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 9

M1 - 092006

ER -