2001/06/29 by NOMAD Collaboration, P. Astier, D. Autiero +98 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ex
paper · pdf · doi:10.1016/s0550-3213(01)00339-x
published as Nucl.Phys.B611:3-39,2001 · 46 pages, 16 figures, Latex, to appear on Nucl. Phys. B
arxiv created 2001/06/29 · openalex publication_date 2001/09/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
Results from the nutau appearance search in a neutrino beam using the full NOMAD data sample are reported. A new analysis unifies all the hadronic tau decays, significantly improving the overall sensitivity of the experiment to oscillations. The "blind analysis" of all topologies yields no evidence for an oscillation signal. In the two-family oscillation scenario, this sets a 90% C.L. allowed region in the sin2(2theta)-Delta m2 plane which includes sin2(2theta)<3.3 x 10-4 at large Delta m2 and Delta m2 < 0.7 eV2/c4 at sin2(2theta)=1. The corresponding contour in the nue->nutau oscillation hypothesis results in sin2(2theta)<1.5 x 10-2 at large Delta m2 and Delta m2 < 5.9 eV2/c4 at sin2(2theta)=1. We also derive limits on effective couplings of the tau lepton to numu or nue.