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Final NOMAD results on nu(mu) -> nu(tau) and nu(e) -> nu(tau) oscillations including a new search for nu(tau) appearance using hadronic tau decays

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Final NOMAD results on nu(mu) -> nu(tau) and nu(e) -> nu(tau) oscillations including a new search for nu(tau) appearance using hadronic tau decays

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NOMAD Collaboration; Astier, P.; Cervera Villanueva, Anselmo; Gómez Cadenas, Juan José

Aquest document és un/a article, creat/da en: 2001

Results from the v, 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% CL allowed region in the sin(2)2 theta (mu tau)-Deltam(2) plane which includes sin(2)2 theta (mu tau) nu (tau) oscillation hypothesis results in sin(2) 2 theta (l tau) < 1.5 x 10(-2) at large Deltam(2) and Deltam(2) < 5.9 eV(2)/c(4) at sin(2) 2 theta (l tau) = 1. We also derive limits on effective couplings of the tau lepton to nu (mu) or nu (l).

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