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

Authors
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, V 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, C 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
Citation
P. Astier et al., A more sensitive search for nu(mu) -> nu(tau) oscillations in NOMAD, PHYS LETT B, 453(1-2), 1999, pp. 169-186
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
453
Issue
1-2
Year of publication
1999
Pages
169 - 186
Database
ISI
SICI code
0370-2693(19990429)453:1-2<169:AMSSFN>2.0.ZU;2-N
Abstract
With additional data and improved algorithms, we have enhanced the sensitiv ity of our appearance search for nu(mu) --> nu(tau) oscillations in the NOM AD detector in the CERN-SPS wide-band neutrino beam. The search uses kinema tic criteria to identify nu(tau) charged current interactions followed by d ecay of the tau(-) to one of several decay modes. Our "blind'' analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consis tent reanalyses of previously reported 1995 data, yield no oscillation sign al. For the two-family oscillation scenario, we present the contour outlini ng a 90% C.L. confidence region in the sin(2)2 theta(mu tau) - Delta m(2) p lane. At large Delta m(2) the confidence region includes sin(2)2 theta(mu t au) < 1.2 X 10(-3) (a limit 3.5 times more stringent than in our previous p ublication), while at sin(2)2 theta(mu tau) = 1 the confidence region inclu des Delta m(2) < 1.2 eV(2)/c(4). (C) 1999 Published by Elsevier Science B.V . All rights reserved.