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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 |
| Institution: | 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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