With additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for nu(mu) --> nu(tau) oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify nu(tau) charged current interactions followed by decay of the tau(-) to one of several decay modes. Our "blind'' analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995 data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90% C.L. confidence region in the sin(2)2 theta(mu tau) - Delta m(2) plane. At large Delta m(2) the confidence region includes sin(2)2 theta(mu tau) < 1.2 X 10(-3) (a limit 3.5 times more stringent than in our previous publication), while at sin(2)2 theta(mu tau) = 1 the confidence region includes Delta m(2) < 1.2 eV(2)/c(4). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

A more sensitive search for nu(mu) -> nu(tau) oscillations in NOMAD

CAVASINNI, VINCENZO;RODA, CHIARA MARIA ANGELA;
1999

Abstract

With additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for nu(mu) --> nu(tau) oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify nu(tau) charged current interactions followed by decay of the tau(-) to one of several decay modes. Our "blind'' analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995 data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90% C.L. confidence region in the sin(2)2 theta(mu tau) - Delta m(2) plane. At large Delta m(2) the confidence region includes sin(2)2 theta(mu tau) < 1.2 X 10(-3) (a limit 3.5 times more stringent than in our previous publication), while at sin(2)2 theta(mu tau) = 1 the confidence region includes Delta m(2) < 1.2 eV(2)/c(4). (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Astier, P; Autiero, D; Baldisseri, A; Baldo Ceolin, M; Ballocchi, G; Banner, M; Bassompierre, G; Benslama, K; Besson, N; Bird, I; Blumenfeld, B; Bobisut, F; Bouchez, J; Boyd, S; Bueno, A; Bunyatov, S; Camilleri, L; Cardini, A; Cattaneo, Pw; Cavasinni, Vincenzo; Cervera Villanueva, A; Collazuol, G; Conforto, G; Conta, C; Contalbrigo, M; Cousins, R; Daniels, D; Degaudenzi, H; Del Prete, T; De Santo, A; Dignan, T; Di Lella, L; Silva, Ede; Donnelly, Ij; Dumarchez, J; Ellis, M; Fazio, T; Feldman, Gj; Ferrari, R; Ferrere, D; Flaminio, V; Fraternali, M; Gaillard, Jm; Gandolfo, A; Gangler, E; Geiser, A; Geppert, D; Gibin, D; Gninenko, S; Godley, A; Gomez Cadenas, Jj; Gosset, J; Gossling, C; Gouanere, M; Grant, A; Graziani, G; Guglielmi, A; Hagner, C; Hernando, J; Hubbard, D; Hurst, P; Hyett, N; Iacopini, E; Joseph, C; Juget, F; Kirsanov, M; Klimov, O; Kokkonen, J; Kovzelev, A; Krasnoperov, A; Kuznetsov, Ve; Lacaprara, S; Lachaud, C; Lakic, B; Lanza, A; La Rotonda, L; Laveder, M; Letessier Selvon, A; Levy, Jm; Linssen, L; Ljubicic, A; Long, J; Lupi, A; Manola Poggioli, E; Marchionni, A; Martelli, F; Mechain, X; Mendiburu, Jp; Meyer, Jp; Mezzetto, M; Mishra, Sr; Moorhead, Gf; Mossuz, L; Nedelec, P; Nefedov, Y; Nguyen Mau, C; Orestano, D; Pastore, F; Peak, Ls; Pennacchio, E; Pessard, H; Petti, R; Placci, A; Pluquet, A; Polesello, G; Pollmann, D; Popov, B; Poulsen, C; Rathouit, P; Reno, R; Renzoni, G; Rico, J; Riemann, P; Roda, CHIARA MARIA ANGELA; Rubbia, A; Salvatore, F; Schahmaneche, K; Schmidt, B; Schmidt, T; Segneri, G; Sevior, M; Sillou, D; Soler, Fjp; Sozzi, G; Steele, D; Steininger, M; Stiegler, U; Stipcevic, M; Stolarczyk, T; Tareb Reyes, M; Taylor, Gn; Tereshchenko, V; Toropin, A; Touchard, Am; Tovey, Sn; Tran, Mt; Tsesmelis, E; Ulrichs, J; Vacavant, L; Valdata Nappi, M; Valuev, V; Vannucci, F; Varvell, Ke; Veltri, M; Vercesi, V; Verkindt, D; Vieira, Jm; Vinogradova, T; Vo, Mk; Volkov, S; Weber, Fv; Weisse, T; Wilson, Ff; Winton, Lj; Yabsley, Bd; Zaccone, H; Zuber, K; Zuccon, P.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/190466
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 47
social impact