Experimental limits on massive neutrinos from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math></span><span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mi mathvariant="normal">−</mi></mrow></msup></mrow></math></span> annihilations at 29 GeV

A search was made in 29-GeV $e^{+}$ $e^{-}$ annihilations for massive neutrinos decaying to $e^{\pm}$ $X^{\mp}$ (ν) where X is a muon or meson. A 300- ${pb}^{- 1}$ data sample yielded just one candidate event with a mass $m_{eX}$ >1.8 GeV. Significant limits are found for new neutrinos with masses from 1.8 to 6.7 GeV and with mixing parameters in the range 3× $10^{- 6}$ <‖U $‖^{2}$ <1. .AE

References (14)

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[c1] Particle Data Group, M. Aguilar-Benitez et al., Phys. Lett. 170B, 1 (1986), and references therein.

[c2] R. E. Shrock, Phys. Rev. D 24, 1232 (1981); R. Thun, Phys. Lett. 134B, 459 (1984); M. Gronau, C. N. Leung, J. Rosner, Phys. Rev. D 29, 2539 (1984); M. L. Perl, Stanford Linear Accelerator Center Report No. SLAC-PUB-3526, 1984 (unpublished).

[c3] D. Bender et al., Phys. Rev. D 30, 515 (1984).

[c4] F. M. Renard, Basics of Electron Positron Collisions (Editions Frontie`res, Dreux, 1981).

[c5] J. D. Jackson and D. L. Scharre, Nucl. Instrum. Methods 128, 13 (1975).

[c6] Y. S. Tsai, Phys. Rev. D 4, 2821 (1971). H. B. Thacker and J. J. Sakurai, Phys. Lett. 36B, 103 (1971). Y. S. Tsai, in Proceedings of the Guangzhou Conference on Theoretical Particle Physics, Guangzhou, China, 1980 (Science, Beijing, China, 1980), p. 1346; F. J. Gilman and S. H. Rhie, Phys. Rev. D 31, 1066 (1985).

[c7] D. Errede et al., Phys. Lett. 149B, 519 (1984).

[c8] In Ref. 7 we estimated 5.5+-2.2 background events for an integrated luminosity of 106 pb ${}^{- 1}$ . This extrapolates to 16+-6 events for 300 pb ${}^{- 1}$ consistent with the 22 low-mass events observed in the data.

[c9] F. Bletzacker and H. T. Nieh, Phys. Rev. D 16, 2115 (1977). Equations (A2) and (A6) of this reference have a sign error in the spin term. B. Humpert and P. N. Scharbach, 16, 2754 (1977).

[c10] B. A. Anderson et al. Phys. Rep. 97, 33 (1983).

[c11] F. Gilman, Comments Nucl. Part. Phys. 16, 231 (1986).

[c12] R. Aleksan, in Massive Neutrinos in Particle Physics and Astrophysics, proceedings of the 6th Moriond Workshop, Tignes, Savoie, France, 1986, edited by O. Fackler and J. Tran Thanh Van (Editions Frontie`res, Gif-sur-Yvette, France, 1986), p. 241.

[c13] C. Wendt et al., Phys. Rev. Lett. 58, 1810 (1987).

[c14] CELLO Collaboration, 1987 International Symposium on Lepton and Photon Interactions at High Energies, Hamburg (unpublished).

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Experimental limits on massive neutrinos from $e^{+}$ $e^{-}$ annihilations at 29 GeV

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Experimental limits on massive neutrinos from e+e− annihilations at 29 GeV

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Experimental limits on massive neutrinos from $e^{+}$ $e^{-}$ annihilations at 29 GeV