Neutrino mixing effects on the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>τ</mi></math></span>-neutrino mass limit

M. M. Guzzo; O. L. G. Peres; V. Pleitez; R. Zukanovich Funchal

doi:10.1103/PhysRevD.53.2851

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Neutrino mixing effects on the $τ$ -neutrino mass limit

M. M. Guzzo

O. L. G. Peres and V. Pleitez

R. Zukanovich Funchal

Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, 13083-970 Campinas, S.P., Brazil

Instituto de Física Teórica, Universidade Estadual Paulista, Rua Pamplona 145, 01405-900 São Paulo, S.P., Brazil

Instituto de Física da Universidade de São Paulo, Caixa Postal 66318, 05389-970, São Paulo, S.P., Brazil

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Phys. Rev. D 53, 2851 – Published 1 March, 1996

DOI: https://doi.org/10.1103/PhysRevD.53.2851

Abstract

We point out that the usual experimental upper bounds on the " $τ$ -neutrino mass" do not apply if neutrino mixing is considered. The suppression of the population of the $τ$ decay spectrum near the end point, caused by mixing, may be compensated by an enhancement because of a resonant mechanism of hadronization. It is necessary therefore to analyze the whole spectrum to infer some limit to the " $τ$ -neutrino mass." We argue that, consequently, neutrino mixing evades the objection to interpret the KARMEN anomaly as a heavy sequential neutrino.

References (19)

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[c1] Ch. Weinheimer et al., Phys. Lett. B 300, 210 (1993) M. Daum et al., ibid. 265, 425 (1991)

[c2] C. Athanassopoulos et al., Phys. Rev. Lett. 75, 2650 (1995)

[c3] ARGUS Collaboration, H. Albrecht et al., Phys. Lett. B 292, 221 (1992) CLEO Collaboration, D. Cinabro et al., Phys. Rev. Lett. 70, 3700 (1993)

[c4] Particle Data Group, L. Montanet et al., Phys. Rev. D 50, 1173 (1994)

[c5] BEBC Collaboration, N. Qi et al., in Proceedings of the XXVII International Conference on High Energy Physics, Glasgow, Scotland, 1994, edited by P. J. Bussey and I. G. Knowles (IOP, London, 1995)

[c6] OPAL Collaboration, R. Akers et al., Z. Phys. C 65, 183 (1995)

[c7] ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 349, 585 (1995)

[c8] [6]

[c9] R. Shrock, Phys. Lett. 96B, 159 (1980) Phys. Rev. D 24, 1232 (1981) ibid.24, 1275 (1981)

[c10] D. I. Britton et al., Phys. Rev. D 46, R885 (1992)

[c11] K. S. Heard et al., Phys. Lett. 55B, 327 (1975) R. S. Hayano et al., Phys. Rev. Lett. 49, 1305 (1982)

[c12] D. A. Douglas, Comments Nucl. Part. Phys. 21 (2), 101 (1993) T. Numao, Mod. Phy. Lett. A 7, 3357 (1992)

[c13] O. L. G. Peres, V. Pleitez, and R. Zukanovich Funchal, Phys. Rev. D 50, 513 (1994)

[c14] M. M. Guzzo, O. L. G. Peres, V. Pleitez, and R. Zukanovich Funchal, "Three generation vacuum oscillations and the solar neutrino problem," Report No. IFT-P.023/95 (hep-ph/9407333) (unpublished) Nonresonant MSW solution to the solar neutrino problem, Report No. IFT-P.003/95 (hep-ph/9412331) (unpublished)

[c15] J. J. Gomez-Cadenas et al., Phys. Rev. D 41, 2179 (1990)

[c16] ALEPH Collaboration, F. Cerutti et al., in Tau 94, Proceedings of the Third Workshop on Tau Lepton Physics, Montreux, Switzerland, edited by L. Rolandi [Nucl. Phys. B (Proc. Suppl.) 40, 71 (1995)]

[c17] A. Bottino, N. Fornengo, C. W. Kim, and G. Mignolla, Limits on the Neutrino Mass and Mixing Angle from Pion and Lepton Decays, Report No. JHU-TIPAC 95018 (hep-ph/9505394) (unpublished)

[c18] KARMEN Collaboration, B. Armbruster et al., Phys. Lett. B 348, 19 (1995)

[c19] V. Barger, R. J. N. Phillips, and S. Sarkar, Phys. Lett. B 352, 365 (1995) ibid.356, 617(E) (1995)

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Neutrino mixing effects on the $τ$ -neutrino mass limit

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Neutrino mixing effects on the τ-neutrino mass limit

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References (19)

Neutrino mixing effects on the $τ$ -neutrino mass limit