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Final NOMAD results on $\nu_{\mu} \to \nu_{\tau}$} and $\nu_e \to \nu_{\tau}$ oscillations including a new search for $\nu_{\tau}$ appearance using hadronic $\tau$ decays

P. Astier D. Autiero A. Baldisseri M. Baldo-Ceolin M. Banner G. Bassompierre 1 N. Besson I. Bird B. Blumenfeld F. Bobisut J. Bouchez S. Boyd A. Bueno S A. Bunyatov L. Camilleri A. Cardini P W. Cattaneo V. Cavasinni A. Chukanov G. Collazuol G. Conforto C. Conta M. Contalbrigo R. Cousins D. Daniels H. Degaudenzi T. del Prete A. de Santo T. Dignan L. Di Lella E Do Couto E. Silva J. Dumarchez M. Ellis T. Fazio 1 G.J. Feldman R. Ferrari D. Ferrere V. Flaminio M. Fraternali J.M. Gaillard 1 E. Gangler A. Geiser D. Geppert D. Gibin S. Gninenko A. Godley J J. Gomez-Cadenas J. Gosset C. Gossling M. Gouanere 1 A. Grant A. Guglielmi C. Hagner J. Hernando D. Hubbard P. Hurst N. Hyett E. Iacopini C L. Joseph F. Juget M. Kirsanov O. Klimov J. Kokkonen A. Kovzelev A. Krasnoperov 1 D. Kustov V. Kuznetsov S. Lacaprara C. Lachaud B. Lakic A. Lanza A. Letessier-Selvon J M. Levy L. Linssen A. Ljubicic J. Long A. Lupi F. Martelli X. Mechain J.P. Mendiburu 1 J P. Meyer M. Mezzetto S R. Mishra G F. Moorhead D. Naumov P. Nedelec 1 Yu. Nefedov C. Nguyen-Mau D. Orestano F. Pastore L S. Peak E. Pennacchio H. Pessard 1 R. Petti A. Placci G. Polesello D. Pollmann A. Polyarush B. Popov C. Poulsen J. Rico P. Riemann C. Roda F. Salvatore K. Schahmaneche B. Schmidt T. Schmidt M. Sevior D. Sillou 1 F J Soler Gabriella Sozzi D. Steele U. Stiegler M. Stipcevic T. Stolarczyk M. Tareb-Reyes G Taylor V. Tereshchenko A. Toropin a M. Touchard S N. Tovey M T. Tran E. Tsesmelis J. Ulrichs L. Vacavant M. Valdata-Nappi V. Valuev 1 F. Vannucci K E. Varvell V. Vercesi G. Vidal-Sitjes J M. Vieira T. Vinogradova F V. Weber T. Weisse F F. Wilson L J. Winton B D. Yabsley H. Zaccone K. Zuber P. Zuccon
Abstract : 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 $\sin^22\theta_{\mu\tau} - \Delta m^2$ plane which includes $\sin^22\theta_{\mu\tau}\ \ 3.3\times10^{-4}$ at large $\Delta m^2$ and $\Delta m^2 0.7$ eV$^2$/$c^4$ at $\sin^22\theta_{\mu \tau}=1$. The corresponding contour in the $\nuenutau$ oscillation hypothesis results in $\sin^22\theta_{e\tau}\ \ 1.5\times10^{-2}$ at large $\Delta m^2$ and $\Delta m^2 5.9$ eV$^2$/$c^4$ at $\sin^22\theta_{e \tau}=1$. We also derive limits on effective couplings of the $\tau$ lepton to \numu or \nue. \end{abstract} \begin{keyword} appearance, neutrino mass, neutrino oscillations \end{keyword} \end{frontmatter}
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Submitted on : Thursday, November 15, 2001 - 3:28:04 PM
Last modification on : Tuesday, November 17, 2020 - 3:12:13 PM

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P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, M. Banner, et al.. Final NOMAD results on $\nu_{\mu} \to \nu_{\tau}$} and $\nu_e \to \nu_{\tau}$ oscillations including a new search for $\nu_{\tau}$ appearance using hadronic $\tau$ decays. Nuclear Physics B, Elsevier, 2001, 611, pp.3-39. ⟨in2p3-00021440⟩

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