Limits to, oscillations and, - direct coupling

N. Ushida, T. Kondo, S. Tasaka, I. G. Park, J. S. Song, T. Hara, Y. Homma, Y. Tsuzuki, G. Fujioka, H. Fukushima, Y. Takahashi, S. Tatsumi, C. Yokoyama, K. Fujiwara, K. Taruma, S. Y. Bahk, C. O. Kim, J. N. Park, D. C. Bailey, S. ConettiP. Mercure, J. Trischuk, M. Turcotte, S. Aoki, K. Chiba, H. Fuchi, K. Hoshino, K. Kodama, R. Matsui, M. Miyanishi, M. Nakamura, K. Nakazawa, K. Niu, K. Niwa, M. Ohashi, H. Sasaki, Y. Tomita, N. Torii, O. Yamakawa, Y. Yanagisawa, G. J. Aubrecht, J. Dunlea, S. Errede, A. Gauthier, M. J. Gutzwiller, S. Kuramata, G. Oleynik, N. W. Reay, K. Reibel, R. A. Sidwell, N. R. Stanton, K. Moriyama, H. Shibata, O. Kusumoto, Y. Noguchi, T. Okusawa, M. Teranaka, J. Yamato, H. Okabe, J. Yokota, S. G. Frederiksen, C. J.D. Hebert, J. Hebert, B. McLeod, M. Kazuno, H. Shibuya, I. A. Lovatt, J. F. Martin, D. Pitman, J. D. Prentice, B. J. Stacey, T. S. Yoon, Y. Maeda

Research output: Contribution to journalArticlepeer-review


We have located 3886 neutrino interactions in the fiducial volume of a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam. A search for - decays yielded no candidate, resulting in an upper limit of 0.002 (0.073) for direct coupling of (e) to -. The (e) to limits to mass differences and mixing angles () between the neutrinos are at maximum mixing M2<0.9 (9.0) eV2, and at maximum sensitivity sin2(2)<0.004 (0.12). The direct-coupling limits are also used to show that most - decays must contain a neutral lepton other than or e.

Original languageEnglish (US)
Pages (from-to)2897-2900
Number of pages4
JournalPhysical review letters
Issue number23
StatePublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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