Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector
Creators: name: MicroBooNE Collaboration
name: Abratenko, P.
name: Anthony, J.
name: Arellano, L.
name: Asaadi, J.
name: Ashkenazi, A.
name: Balasubramanian, S.
name: Baller, B.
name: Barnes, C.
name: Barr, G.
name: Barrow, J.
name: Basque, V.
name: Bathe-Peters, L.
name: Rodrigues, O. Benevides
name: Berkman, S.
name: Bhanderi, A.
name: Bhattacharya, M.
name: Bishai, M.
name: Blake, A.
name: Bogart, B.
name: Bolton, T.
name: Book, J. Y.
name: Camilleri, L.
name: Caratelli, D.
name: Terrazas, I. Caro
name: Cavanna, F.
name: Cerati, G.
name: Chen, Y.
name: Conrad, J. M.
name: Convery, M.
name: Cooper-Troendle, L.
name: Crespo-Anadon, J. I.
name: Del Tutto, M.
name: Dennis, S. R.
name: Detje, P.
name: Devitt, A.
name: Diurba, R.
name: Dorrill, R.
name: Duffy, K.
name: Dytman, S.
name: Eberly, B.
name: Ereditato, A.
name: Evans, J. J.
name: Fine, R.
name: Finnerud, O. G.
name: Fleming, B. T.
name: Foppiani, N.
name: Foreman, W.
name: Franco, D.
name: Furmanski, A. P.
name: Garcia-Gamez, D.
name: Gardiner, S.
name: Ge, G.
name: Gollapinni, S.
name: Goodwin, O.
name: Gramellini, E.
name: Green, P.
name: Greenlee, H.
name: Gu, W.
name: Guenette, R.
name: Guzowski, P.
name: Hagaman, L.
name: Hen, O.
name: Hicks, R.
name: Hilgenberg, C.
name: Horton-Smith, G. A.
name: Itay, R.
name: James, C.
name: Ji, X.
name: Jiang, L.
name: Jo, J. H.
name: Johnson, R. A.
name: Jwa, Y. J.
name: Kalra, D.
name: Kamp, N.
name: Kaneshige, N.
name: Karagiorgi, G.
name: Ketchum, W.
name: Kirby, M.
name: Kobilarcik, T.
name: Kreslo, I.
name: Leibovitch, M. B.
name: Lepetic, I.
name: Li, J. -Y.
name: Li, K.
name: Li, Y.
name: Lin, K.
name: Littlejohn, B. R.
name: Louis, W. C.
name: Luo, X.
name: Manivannan, K.
name: Mariani, C.
name: Marsden, D.
name: Marshall, J.
name: Caicedo, D. A. Martinez
name: Mason, K.
name: Mastbaum, A.
name: McConkey, N.
name: Meddage, V.
name: Miller, K.
name: Mills, J.
name: Mistry, K.
name: Mohayai, T.
name: Mogan, A.
name: Mooney, M.
name: Moor, A. F.
name: Moore, C. D.
name: Lepin, L. Mora
name: Mousseau, J.
name: Babu, S. Mulleria
name: Naples, D.
name: Navrer-Agasson, A.
name: Nayak, N.
name: Nebot-Guinot, M.
name: Newmark, D. A.
name: Nowak, J.
name: Nunes, M.
name: Oza, N.
name: Palamara, O.
name: Pallat, N.
name: Paolone, V.
name: Papadopoulou, A.
name: Papavassiliou, V.
name: Parkinson, H.
name: Pate, S. F.
name: Patel, N.
name: Pavlovic, Z.
name: Piasetzky, E.
name: Ponce-Pinto, I.
name: Prince, S.
name: Qian, X.
name: Raaf, J. L.
name: Radeka, V.
name: Rafique, A.
name: Reggiani-Guzzo, M.
name: Ren, L.
name: Rice, L. C. J.
name: Rochester, L.
name: Rondon, J. Rodriguez
name: Rosenberg, M.
name: Ross-Lonergan, M.
name: von Rohr, C. Rudolph
name: Scanavini, G.
name: Schmitz, D. W.
name: Schukraft, A.
name: Seligman, W.
name: Shaevitz, M. H.
name: Sharankova, R.
name: Shi, J.
name: Smith, A.
name: Snider, E. L.
name: Soderberg, M.
name: Soldner-Rembold, S.
name: Spitz, J.
name: Stancari, M.
name: John, J. St.
name: Strauss, T.
name: Sword-Fehlberg, S.
name: Szelc, A. M.
name: Tang, W.
name: Taniuchi, N.
name: Terao, K.
name: Thorpe, C.
name: Torbunov, D.
name: Totani, D.
name: Toups, M.
name: Tsai, Y. -T.
name: Tyler, J.
name: Uchida, M. A.
name: Usher, T.
name: Viren, B.
name: Weber, M.
name: Wei, H.
name: White, A. J.
name: Williams, Z.
name: Wolbers, S.
name: Wongjirad, T.
name: Wospakrik, M.
name: Wresilo, K.
name: Wright, N.
name: Wu, W.
name: Yandel, E.
name: Yang, T.
name: Yates, L. E.
name: Yu, H. W.
name: Zeller, G. P.
name: Zennamo, J.
name: Zhang, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 NuMI neutrino beam from Fermilab's Main Injector with a total exposure corresponding to $7.01 \times 10^{20}$ protons on target. We set upper limits at the $90\%$ confidence level on the mixing parameter $\lvert U_{μ4}\rvert^2$ ranging from $\lvert U_{μ4}\rvert^2&lt;12.9\times 10^{-8}$ for Majorana HNLs with a mass of $m_{\rm HNL}=246$ MeV to $\lvert U_{μ4}\rvert^2&lt;0.92 \times 10^{-8}$ for $m_{\rm HNL}=385$ MeV, assuming $\lvert U_{e 4}\rvert^2 = \lvert U_{τ4}\rvert^2 = 0$ and HNL decays into $μ^\pmπ^\mp$ pairs. These limits on $\lvert U_{μ4}\rvert^2$ 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 $θ^2&lt;31.3 \times 10^{-9}$ for $m_{\rm HPS}=212$ GeV and $θ^2&lt;1.09 \times 10^{-9}$ for $m_{\rm HPS}=275$ GeV. These are the first constraints on the scalar-Higgs mixing angle $θ$ from a dedicated experimental search in this mass range.
description: This paper is dedicated to the memory of Salvatore Davide Porzio. This is the journal accepted version with only minor presentational changes compared to preprint