4 research outputs found

    Limit on νe→ντ oscillations from the NOMAD experiment

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    In the context of a two-flavour approximation we reinterpret the published NOMAD limit on nu(mu) --> nu(tau) oscillations in terms of nu(e) --> nu(tau) oscillations. At 90% C.L. we obtain sin2(2)theta(e tau) < 5.2 X 10(-2) for large Delta m(2), while for sin2(2)theta(e tau) = 1 the confidence region includes Delta m(2) < 11 eV(2)/c(4)

    Updated results from the ν<sub>τ</sub> appearance search in NOMAD

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    Updated results from the appearance searches for nu(mu) → nu(tau) and nu(e) → nu(tau) oscillations in the full NOMAD data sample are reported. The increased data and the use of more refined kinematic schemes for the nu(tau) CC selection allow a significant improvement of the overall sensitivity. The "blind analysis" of both the deep-inelastic and the low multiplicity samples yields no evidence for an oscillation signal. In the two-family oscillation scenario, this sets a 90% C.L. region in the sin(2)2 theta(mu tau) - Delta m(2) plane which includes sin(2)2 theta(mu tau) lt 4.4 X 10(-4) at large Delta m(2) and Delta m(2) lt 0.8 eV(2)/c(4) at sin(2)2 theta(mu tau) = 1. The corresponding contour in the nu(e) → nu(tau) oscillation hypothesis results in sin(2)2 theta(e tau) lt 2.2 X 10(-2) at large Delta m(2) and Delta m(2) lt 6.5 eV(2)/c(4) at sin(2)2 theta(e tau) = 1

    Updated results from the ντ\nu_{\tau} appearance search in Nomad

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    Updated results from the appearance searches for \numunutau and \nuenutau oscillations in the full NOMAD data sample are reported. The increased data and the use of more refined kinematic schemes for the \nutau CC selection allow a significant improvement of the overall sensitivity. The ``blind analysis" of both the deep-inelastic and the low multiplicity samples yields no evidence for an oscillation signal. In the two-family oscillation scenario, this sets a 90\% C.L. region in the sin22θμτΔm2\sin^22\theta_{\mu\tau} - \Delta m^2 plane which includes sin22θμτ  4.4×104\sin^22\theta_{\mu\tau}\ \ 4.4\times10^{-4} at large Δm2\Delta m^2 and Δm20.8\Delta m^2 0.8 eV2^2/c4c^4 at sin22θμτ=1\sin^22\theta_{\mu \tau}=1. The corresponding contour in the \nuenutau oscillation hypothesis results in sin22θeτ  2.2×102\sin^22\theta_{e\tau}\ \ 2.2\times10^{-2} at large Δm2\Delta m^2 and Δm26.5\Delta m^2 6.5 eV2^2/c4c^4 at $\sin^22\theta_{e \tau}=1

    Limit on νeντ\nu_{e} \to \nu_{\tau} Oscillations from the NOMAD experiment

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