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23 April 2024

» arxiv » hep-ex/9801007

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KARMEN Limits on nu_e -> nu_tau Oscillations in 2-neutrino and 3-neutrino Mixing Schemes
B. Armbruster ; I. Blair ; B.A. Bodmann ; N.E. Booth ; G. Drexlin ; V. Eberhard ; J.A. Edgington ; C. Eichner ; K. Eitel ; E. Finckh ; H. Gemmeke ; J. Hoessl ; T. Jannakos ; P. Juenger ; M. Kleifges ; J. Kleinfeller ; W. Kretschmer ; R. Maschuw ; C. Oehler ; P. Plischke ; J. Rapp ; C. Ruf ; M. Steidl ; O. Stumm ; J. Wolf ; B. Zeitnitz ;
Date:	8 Dec 1997
Journal:	Phys.Rev. C57 (1998) 3414-3424
Subject:	hep-ex
Abstract:	The 56 tonne high resolution liquid scintillation calorimeter KARMEN at the beam stop neutrino source ISIS has been used to search for neutrino oscillations in the disappearance channel nu_e->x. The nu_e emitted in mu+ decay at rest are detected with spectroscopic quality via the exclusive charged current reaction 12-C(nu_e,e-)12-N_g.s. almost free of background. Analysis of the spectral shape of e- from the nu_e induced reaction as well as a measurement of the absolute nu_e flux allow to investigate oscillations of the type nu_e->nu_tau and nu_e->nu_mu . The flux independent ratio R(CC/NC) of charged current events 12-C(nu_e,e-)12-N_g.s. to neutral current events 12-C(nu,nu’)12-C* provides additional information in the oscillation channel nu_e->x . All three analysis methods show no evidence for oscillations. For the nu_e->nu_tau channel 90%CL limits of sin^2(2t)<0.338 for dm^2>100eV^2 and dm^2<0.77eV^2 for maximal mixing in a simple 2 flavor oscillation formalism are derived. A complete 3 flavor analysis of the experimental data from five years of measurement with respect to nu_e<->nu_tau and nu_e<->nu_mu mixing is presented.
Source:	arXiv, hep-ex/9801007
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