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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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