Abstract
A search for νμ → ν e and\(\bar \nu _\mu \to \bar \nu _e \) oscillations has been carried out with the CHARM II detector exposed to the CERN wide band neutrino beam. The data were collected over five years, alternating beams mainly composed of muon-neutrinos and muon-antineutrinos. The number of interactions of ν e and\(\bar \nu _e \) observed is comparable with the number of events expected from flux calculations. For large squared mass differences the upper limits obtained on the mixing angle aresin 22θ < 9.4 · 10−3 for νμ oscillating to ν e andsin 22θ < 4.8 · 10−3 for\(\bar \nu _\mu \) to\(\bar \nu _e \), at the 90% confidence level. Combining neutrino and antineutrino data the upper limit is 5.6 · 10−3.
Similar content being viewed by others
References
L.A. Ahrens et al., Phys. Rev. D31 (1985) 2732
L. Borodovsky et al., Phys. Rev. Lett. 68 (1992) 274
CHARM Collab., F. Bergsma et al., Z. Phys. C 40 (1988) 171
CHARM II Collab., K. De Winter et al., Nucl. Instr. Meth. A 278 (1989) 670; CHARM II Collab., D. Geiregat et al., Nucl. Instr. Meth. A 325 (1993) 92
CHARM II Collab., D. Geiregat et al., Phys. Lett. B 259 (1991) 499; CHARM II Collab., P. Vilain et al., CERN-PPE/94-124
T. Voss, Ph.D. thesis, Hamburg University, 1993 (unpublished)
CHORUS Collab., M. de Jong et al., CERN-PPE/93-131
H.W. Atherton et al., CERN Yellow Report 80-07 (1980)
CHARM II Collab., P. Vilain et al., Phys. Lett. B 281 (1992) 159
M. Serin-Zeyrek, Ph.D. thesis, M.E.T.U., Ankara, 1992 (unpublished)
C. Angelini et al., Phys. Lett. B 179 (1986) 307
Author information
Authors and Affiliations
Consortia
Additional information
On leave of absence from ITEP (Moscow)
Supported by the German Bundesministerium für Forschung und Technologie under contract numbers 05-4HH22P and 05-4MU12P
Rights and permissions
About this article
Cite this article
CHARM II Collaboration., Vilain, P., Wilquet, G. et al. Search for muon to electron neutrino oscillations. Z. Phys. C - Particles and Fields 64, 539–544 (1994). https://doi.org/10.1007/BF01957768
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01957768