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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 16
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Phys. Rev. Lett. 82, 3202–3205 (1999)

Atmospheric Neutrino Observations and Flavor Changing Interactions

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M. C. Gonzalez-Garcia1, M. M. Guzzo2, P. I. Krastev3, H. Nunokawa2, O. L. G. Peres1, V. Pleitez4, J. W. F. Valle1, and R. Zukanovich Funchal5
1Instituto de Física Corpuscular—C.S.I.C., Departamento de Física Teòrica, Universitat of València, 46100 Burjassot, València, Spain
2Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, 13083-970–Campinas, Brazil
3University of Wisconsin, Madison, Wisconsin 53706
4Instituto de Física Teórica, Universidade Estadual Paulista, R. Pamplona 145, 01405-900 São Paulo, Brazil
5Instituto de Física, Universidade de São Paulo, C.P. 66.318, 05389-970 São Paulo, Brazil

Received 2 November 1998; published in the issue dated 19 April 1999

Flavor changing (FC) neutrino-matter interactions can account for the zenith-angle-dependent deficit of atmospheric neutrinos observed in the SuperKamiokande experiment, without directly invoking either neutrino mass or mixing. We find that FC νμ-matter interactions provide a good fit to the observed zenith angle distributions, comparable in quality to the neutrino oscillation hypothesis. The required FC interactions arise naturally in many attractive extensions of the standard model.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.3202
DOI:
10.1103/PhysRevLett.82.3202
PACS:
14.60.Pq, 14.60.St, 25.30.Pt, 96.40.Tv
 
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