A more sensitive search for vμ → Vτ oscillations in NOMAD

P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, M. Banner, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Bunyatov, L. Camilleri, A. Cardini, P. W. Cattaneo, V. CavasinniA. 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. do Couto e Silva, I. J. Donnelly, J. Dumarchez, M. Ellis, T. Fazio, G. J. Feldman, R. Ferrari, D. Ferrère, V. Flaminio, M. Fraternali, J. M. Gaillard, A. Gandolfo, E. Gangler, A. Geiser, D. Geppert, D. Gibin, S. Gninenko, A. Godley, J. J. Gomez-Cadenas, J. Gosset, C. Gößling, M. Gouanère, 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, V. E. Kuznetsov, S. Lacaprara, C. Lachaud, B. Lakić, A. Lanza, L. la Rotonda, M. Laveder, A. Letessier-Selvon, J. M. Levy, L. Linssen, A. Ljubičić, J. Long, A. Lupi, E. Manola-Poggioli, A. Marchionni, F. Martelli, X. Méchain, J. P. Mendiburu, J. P. Meyer, M. Mezzetto, S. R. Mishra, G. F. Moorhead, L. Mossuz, P. Nédélec, Y. Nefedov, C. Nguyen-Mau, D. Orestano, F. Pastore, L. S. Peak, E. Pennacchio, H. Pessard, R. Petti, A. Placci, A. Pluquet, G. Polesello, D. Pollmann, B. Popov, C. Poulsen, P. Rathouit, R. Reno, G. Renzoni, J. Rico, P. Riemann, C. Roda, A. Rubbia, F. Salvatore, K. Schahmaneche, B. Schmidt, T. Schmidt, G. Segneri, M. Sevior, D. Sillou, F. J.P. Soler, G. Sozzi, D. Steele, M. Steininger, U. Stiegler, M. Stipčević, T. Stolarczyk, M. Tareb-Reyes, G. N. 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, F. Vannucci, K. E. Varvell, M. Veltri, V. Vercesi, D. Verkindt, J. M. Vieira, T. Vinogradova, M. K. Vo, S. Volkov, F. V. Weber, T. Weisse, F. F. Wilson, L. J. Winton, B. D. Yabsley, H. Zaccone, K. Zuber, P. Zuccon

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

With additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for vμ → vτ oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify vτ charged current interactions followed by decay of the τ- 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 sin2μτ-Δm2plane. At large Δm2, the confidence region includes sin2μτ <1.2 × 10-3 (a limit 3.5 times more stringent than in our previous publication), while at sin2μτ = 1, the confidence region includes Δm2 < 1.2 eV2/c4.

Original languageEnglish (US)
Pages (from-to)169-186
Number of pages18
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume453
Issue number1-2
DOIs
StatePublished - 1999

Keywords

  • Neutrino oscillations

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    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, P. W., ... Zuccon, P. (1999). A more sensitive search for vμ → Vτ oscillations in NOMAD. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 453(1-2), 169-186. https://doi.org/10.1016/S0370-2693(99)00303-2