A more sensitive search for νμ → ντ oscillations in NOMAD

被引:46
作者
Astier, P [1 ]
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
Ferrère, D
Flaminio, V
Fraternali, M
Gaillard, JM
Gandolfo, A
Gangler, E
Geiser, A
Geppert, D
Gibin, D
Gninenko, S
Godley, A
机构
[1] Univ Paris 06, LPNHE, Paris, France
[2] Univ Paris 07, LPNHE, Paris, France
[3] LAPP, Annecy, France
[4] Johns Hopkins Univ, Baltimore, MD 21218 USA
[5] Harvard Univ, Cambridge, MA 02138 USA
[6] Univ Calabria, I-87036 Cosenza, Italy
[7] Ist Nazl Fis Nucl, Cosenza, Italy
[8] Univ Dortmund, Dortmund, Germany
[9] Joint Inst Nucl Res Dubna, Dubna, Russia
[10] Univ Florence, Florence, Italy
[11] Ist Nazl Fis Nucl, I-50125 Florence, Italy
[12] CERN, Geneva, Switzerland
[13] Univ Lausanne, Lausanne, Switzerland
[14] Univ Calif Los Angeles, Los Angeles, CA USA
[15] Univ Melbourne, Melbourne, Vic, Australia
[16] Russian Acad Sci, Inst Nucl Res, Moscow, Russia
[17] Univ Padua, Padua, Italy
[18] Ist Nazl Fis Nucl, Padua, Italy
[19] Univ Pisa, Pisa, Italy
[20] Ist Nazl Fis Nucl, Pisa, Italy
[21] Roma Tre Univ, Rome, Italy
[22] Ist Nazl Fis Nucl, Rome, Italy
[23] ANSTO Sydney, Menai, NSW, Australia
[24] Univ Sydney, Sydney, NSW 2006, Australia
[25] Univ Urbino, I-61029 Urbino, Italy
[26] IFIC, Valencia, Spain
[27] Rudjer Boskovic Inst, Zagreb, Croatia
[28] ETH Zurich, Zurich, Switzerland
基金
美国国家科学基金会; 澳大利亚研究理事会;
关键词
neutrino oscillations;
D O I
10.1016/S0370-2693(99)00303-2
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:169 / 186
页数:18
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