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

P. Astier D. Autiero A. Baldisseri M. Baldo-Ceolin G. Ballocchi M. Banner G. Bassompierre 1 K. Benslama N. Besson I G. Bird B. Blumenfeld F. Bobisut J. Bouchez S. Boyd A. Bueno S. Bunyatov L. Camilleri A. Cardini P W. Cattaneo V. Cavasinni A. Cervera-Villanueva 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 Silva E. Do Couto J. Dumarchez M. Ellis G J. Feldman R. Ferrari D. Ferrhre V. Flaminio M. Fraternali J.M. Gaillard 1 E. Gangler A. Geiser D. Geppert D. Gibin S. Gninenko A. Godley J J. Gsmez-Cadenas J. Gosset C. Gossling M. Gouanere 1 A. Grant G. Graziani A. Guglielmi C. Hagner J. Hernando D. Hubbard P. Hurst N. Hyett E. Iacopini C. Joseph F. Juget M. Kirsanov O. Klimov J. Kokkonen A. Kovzelev A. Krasnoperov 1 V E. Kuznetsov S. Lacaprara C. Lachaud B. Lakic A. Lanza L. La Rotonda M. Laveder A. Letessier-Selvon J M. Levy L. Linssen A. Ljubicic J. Long A. Lupi A. Marchionni F. Martelli X. Mechain J.P. Mendiburu 1 J P. Meyer M. Mezzetto S R. Mishra G F. Moorhead P. Nedelec 1 Yu. Nefedov C. Nguyen-Mau D. Orestano F. Pastore L S. Peak E. Pennacchio H. Pessard 1 R. Petti A. Placci A. Pluquet A. Polayrush G. Polesello D. Pollmann B. Popov C. Poulsen P. Rathouit J. Rico P. Riemann C. Roda A. Rubbia F. Salvatore K. Schahmaneche B. Schmidt T. Schmidt M. Sevior D. Sillou 1 F J P. Soler Gabriella Sozzi D. Steele M. Steininger U. Stiegler M. Stipcevic T. Stolarczyk M. Tareb-Reyes G N. Taylor 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 M. Veltri V. Vercesi J M. Vieira T G. Vinogradova F V. Weber T. Weisse F F. Wilson L J. Winton B D. Yabsley H. Zaccone K. Zuber P. Zuccon
Abstract : 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 $\sin^22\theta_{\mu\tau} - \Delta m^2$ plane which includes $\sin^22\theta_{\mu\tau}\ \ 4.4\times10^{-4}$ at large $\Delta m^2$ and $\Delta m^2 0.8$ eV$^2$/$c^4$ at $\sin^22\theta_{\mu \tau}=1$. The corresponding contour in the $\nuenutau$ oscillation hypothesis results in $\sin^22\theta_{e\tau}\ \ 2.2\times10^{-2}$ at large $\Delta m^2$ and $\Delta m^2 6.5$ eV$^2$/$c^4$ at $\sin^22\theta_{e \tau}=1$
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Submitted on : Friday, August 4, 2000 - 10:08:10 AM
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P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, et al.. Updated results from the $\nu_{\tau}$ appearance search in Nomad. Physics Letters B, Elsevier, 2000, 483, pp.387-404. ⟨in2p3-00005741⟩

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