Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-06-29
Nucl.Phys.B611:3-39,2001
Physics
High Energy Physics
High Energy Physics - Experiment
46 pages, 16 figures, Latex, to appear on Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(01)00339-X
Results from the nu_tau 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 sin^2(2theta)-Delta m^2 plane which includes sin^2(2theta)<3.3 x 10^{-4} at large Delta m^2 and Delta m^2 < 0.7 eV^2/c^4 at sin^2(2theta)=1. The corresponding contour in the nu_e->nu_tau oscillation hypothesis results in sin^2(2theta)<1.5 x 10^{-2} at large Delta m^2 and Delta m^2 < 5.9 eV^2/c^4 at sin^2(2theta)=1. We also derive limits on effective couplings of the tau lepton to nu_mu or nu_e.
Astier Pierre
NOMAD Collaboration
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