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A search for neutrino oscillations |
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| Authors: | F. Bergsma J. Dorenbosch C. Nieuwenhuis J. V. Allaby U. Amaldi G. Barbiellini A. Capone Y. Eisenberg W. Flegel M. Jonker L. Lanceri M. Metcalf J. Panman D. Perret-Gallix R. Plunkett C. Santoni K. Winter I. Abt J. Aspiazu F. W. Büsser H. Daumann P. D. Gall T. Hebbeker F. Niebergall P. Schütt P. Stähelin P. Gorbunov E. Grigoriev V. Kaftanov V. Khovansky A. Rosanov L. Barone B. Borgia M. Diemoz U. Dore F. Ferroni E. Longo L. Luminari P. Monacelli F. de Notaristefani E. Valente CHARM Collaboration |
| Affiliation: | 1. NIKHEF, Amsterdam, The Netherlands 2. European Organization for Nuclear Research, CERN, CH-1211, Geneva 23, Switzerland 6. II. Institut für Experimentalphysik, Universit?t Hamburg, D-2000, Hamburg, Federal Republic of Germany 7. Institute for Theoretical and Experimental Physics, SU-117259, Moscow, USSR 8. Istituto Nazionale di Fisica Nucleare, I-00100, Rome, Italy |
| Abstract: | We present here the final results of experiments searching for neutrino oscillations, carried out by the CHARM Collaboration. The data — taking took place in 1983. The first experiment was performed by exposing two detectors simultaneously to the CERN PS low energyv µ beam. In the second experiment the full CHARM detector was exposed to the wide-band horn-focusedv µ beam of the CERN SPS. Complete details of the experiments and data reduction are presented. No statistically significant signals for neutrino oscillations were observed. Our 90% CL limits in the appearance experiment (v µ→v e ) exclude Δm 2≧0.19 eV2 for complete mixing (sin22θ=1), and sin22θ≧0.008 for the region Δm 2≧30 eV2. These results, and the limits observed for (v µ→v x ) (disappearance of (v µ), are in agreement with those of most other experiments but exclude part of the region previously reported as a possible indication ofv µ→v e oscillations. |
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