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Search for heavy neutral leptons decaying into muon-pion pairs in the MicroBooNE detector

  • Author(s): Abratenko, P
  • Alrashed, M
  • An, R
  • Anthony, J
  • Asaadi, J
  • Ashkenazi, A
  • Balasubramanian, S
  • Baller, B
  • Barnes, C
  • Barr, G
  • Basque, V
  • Berkman, S
  • Bhanderi, A
  • Bhat, A
  • Bishai, M
  • Blake, A
  • Bolton, T
  • Camilleri, L
  • Caratelli, D
  • Caro Terrazas, I
  • Castillo Fernandez, R
  • Cavanna, F
  • Cerati, G
  • Chen, Y
  • Church, E
  • Cianci, D
  • Cohen, EO
  • Conrad, JM
  • Convery, M
  • Cooper-Troendle, L
  • Crespo-Anadón, JI
  • Del Tutto, M
  • Devitt, D
  • Domine, L
  • Duffy, K
  • Dytman, S
  • Eberly, B
  • Ereditato, A
  • Escudero Sanchez, L
  • Evans, JJ
  • Fitzpatrick, RS
  • Fleming, BT
  • Foppiani, N
  • Franco, D
  • Furmanski, AP
  • Garcia-Gamez, D
  • Gardiner, S
  • Genty, V
  • Goeldi, D
  • Gollapinni, S
  • Goodwin, O
  • Gramellini, E
  • Green, P
  • Greenlee, H
  • Gu, L
  • Gu, W
  • Guenette, R
  • Guzowski, P
  • Hamilton, P
  • Hen, O
  • Hill, C
  • Horton-Smith, GA
  • Hourlier, A
  • Huang, EC
  • Itay, R
  • James, C
  • Jan De Vries, J
  • Ji, X
  • Jiang, L
  • Jo, JH
  • Johnson, RA
  • Joshi, J
  • Jwa, YJ
  • Karagiorgi, G
  • Ketchum, W
  • Kirby, B
  • Kirby, M
  • Kobilarcik, T
  • Kreslo, I
  • Lazur, R
  • Lepetic, I
  • Li, Y
  • Lister, A
  • Littlejohn, BR
  • Lockwitz, S
  • Lorca, D
  • Louis, WC
  • Luethi, M
  • Lundberg, B
  • Luo, X
  • Marchionni, A
  • Marcocci, S
  • Mariani, C
  • Marshall, J
  • Martin-Albo, J
  • Martinez Caicedo, DA
  • Mason, K
  • Mastbaum, A
  • McConkey, N
  • Meddage, V
  • et al.
Abstract

We present upper limits on the production of heavy neutral leptons (HNLs) decaying to μπ pairs using data collected with the MicroBooNE liquid-argon time projection chamber (TPC) operating at Fermilab. This search is the first of its kind performed in a liquid-argon TPC. We use data collected in 2017 and 2018 corresponding to an exposure of 2.0×1020 protons on target from the Fermilab Booster Neutrino Beam, which produces mainly muon neutrinos with an average energy of ≈800 MeV. HNLs with higher mass are expected to have a longer time of flight to the liquid-argon TPC than Standard Model neutrinos. The data are therefore recorded with a dedicated trigger configured to detect HNL decays that occur after the neutrino spill reaches the detector. We set upper limits at the 90% confidence level on the element |Uμ4|2 of the extended PMNS mixing matrix in the range |Uμ4|2<(6.6-0.9)×10-7 for Dirac HNLs and |Uμ4|2<(4.7-0.7)×10-7 for Majorana HNLs, assuming HNL masses between 260 and 385 MeV and |Ue4|2=|Uτ4|2=0.

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