Updated results from the appearance searches for ν(υ) → ν(τ) and ν(e) → ν(τ) oscillations in the full NOMAD data sample are reported. The increased data and the use of more refined kinematic schemes for the ν(τ) 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 2θ(μτ) - Δm 2 plane which includes sin 2 2θ(μτ) < 4.4 x 10 -4 at large Δm 2 and Δm 2 <0.8 eV 2 /c 4 at sin 2 2θ(μτ) = 1. The corresponding contour in the v(e) → ν(τ) oscillation hypothesis results in sin 2 2θ(eτ) < 2.2 x 10 -2 at large Δm 2 and Δm 2 <6.5 eV 2 /c 4 at sin 2 2θ(eτ) = 1. © 2000 Elsevier Science B.V
Updated results from the nu(tau ) appearance search in NOMAD / Astier, P., Autiero, D., Baldisseri, A., Baldo-Ceolin, M., Ballocchi, G., Banner, M., Bassompierre, G., Benslama, K., Besson, N., Bird, I., Blumenfeld, B.J., Bobisut, F., Bouchez, J., Boyd, S., Bueno, A., Bunyatov, S., Camilleri, L., Cardini, A., Cattaneo, P.W., Cavasinni, V., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 483:4(2000), pp. 387-404. [10.1016/S0370-2693(00)00611-0]
Updated results from the nu(tau) appearance search in NOMAD
P. Zuccon;
2000-01-01
Abstract
Updated results from the appearance searches for ν(υ) → ν(τ) and ν(e) → ν(τ) oscillations in the full NOMAD data sample are reported. The increased data and the use of more refined kinematic schemes for the ν(τ) 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 2θ(μτ) - Δm 2 plane which includes sin 2 2θ(μτ) < 4.4 x 10 -4 at large Δm 2 and Δm 2 <0.8 eV 2 /c 4 at sin 2 2θ(μτ) = 1. The corresponding contour in the v(e) → ν(τ) oscillation hypothesis results in sin 2 2θ(eτ) < 2.2 x 10 -2 at large Δm 2 and Δm 2 <6.5 eV 2 /c 4 at sin 2 2θ(eτ) = 1. © 2000 Elsevier Science B.V| File | Dimensione | Formato | |
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