Improved Search for Muon-Neutrino to Electron-Neutrino Oscillations in MINOS

We report the results of a search for ${\ensuremath{\nu}}_{e}$ appearance in a ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of $8.2\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on the NuMI target at Fermilab, we find that $2{sin}^{2}({\ensuremath{\theta}}_{23}){sin}^{2}(2{\ensuremath{\theta}}_{13})<0.12(0.20)$ at 90% confidence level for $\ensuremath{\delta}=0$ and the normal (inverted) neutrino mass hierarchy, with a best-fit of $2{sin}^{2}({\ensuremath{\theta}}_{23}){sin}^{2}(2{\ensuremath{\theta}}_{13})={0.041}_{\ensuremath{-}0.031}^{+0.047}({0.079}_{\ensuremath{-}0.053}^{+0.071})$. The…

• NS
  National Science Foundation
• UD
  U.S. Department of Energy
• MD
  Minnesota Department of Natural Resources
• UO
  University of Minnesota
• FD
  Fundação de Amparo à Pesquisa do Estado de São Paulo
• CD
  Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
• CN
  Conselho Nacional de Desenvolvimento Científico e Tecnológico
• NA
  National and Kapodistrian University of Athens
• SA
  Science and Technology Facilities Council

  Awards: ST/H001093/1, ST/H001026/2, PP/E000347/1, MINOS/MINOS+, ST/H001026/1, ST/H001093/2, ST/I002626/1, ST/I002804/1, ST/I507034/1, ST/K00073X/1, ST/H000887/2
• F
  Fermilab