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    Abratenko, P.; Asaadi, J.; Ashkenazi, A.; Balasubramanian, S.; Baller, B.; Barnes, C.; Barr, G.; Bhanderi, A.; Bishai, M.; Blake, A.; Bolton, T.; Caratelli, D.; Caro Terrazas, I.; Castillo Fernandez, R.; Cavanna, F.; Cerati, G.; Church, E.; Cianci, D.; Domine, L.; Dytman, S.; Eberly, B.; Ereditato, A.; Evans, J. J.; Fitzpatrick, R. S.; Fleming, B. T.; Foppiani, N.; Franco, D.; Furmanski, A. P.; Goeldi, D.; Gramellini, E.; Green, P.; Gu, W.; Hen, O.; Hill, C.; Horton-Smith, G. A.; Itay, R.; Jan de Vries, J.; Ji, X.; Jiang, L.; Jo, J. H.; Johnson, R. A.; Joshi, J.; Ketchum, W.; Kirby, M.; Kobilarcik, T.; LaZur, R.; Lepetic, I.; Li, Y.; Lockwitz, S.; Lorca, D.; Louis, W. C.; Lundberg, B.; Luo, X.; Mariani, C.; Marshall, J.; Martin-Albo, J.; Martinez Caicedo, D. A.; Mastbaum, A.; Meddage, V.; Mettler, T.; Miller, K.; Mogan, A.; Mohayai, T.; Moon, J.; Moore, C. D.; Mousseau, J.; Nienaber, P.; Nowak, J.; Papavassiliou, V.; Pate, S. F.; Paudel, A.; Pavlovic, Z.; Pulliam, G.; Raaf, J. L.; Rochester, L.; Rudolf von Rohr, C.; Russell, B.; Schmitz, D. W.; Sharankova, R.; Sinclair, J.; Smith, A.; Snider, E. L.; Soderberg, M.; Söldner-Rembold, S.; Soleti, S. R.; John, J. St; Tagg, N.; Thornton, R. T.; Tufanli, S.; Uchida, M. A.; Usher, T.; Van De Pontseele, W.; Van de Water, R. G.; Wei, H.; Wickremasinghe, D. A.; Williams, Z.; Woodruff, K.; Yates, L. E.; Zeller, G. P.; Zennamo, J.

    Physical review. D, 03/2020, Letnik: 101, Številka: 5
    Journal Article

    We present upper limits on the production of heavy neutral leptons (HNLs) decaying to μ π 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.