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APS » Journals » Phys. Rev. D » Volume 70 » Issue 11
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Phys. Rev. D 70, 113004 (2004) [12 pages]

NuTeV anomaly, lepton universality, and nonuniversal neutrino-gauge couplings

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Will Loinaz*
Department of Physics, Amherst College, Amherst, Massachusetts 01002, USA
Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA

Naotoshi Okamura†
Korea Institute for Advanced Study, 207-43 Cheongnyangni 2-dong, Dongdaemun-gu, Seoul 130-722, Korea

Saifuddin Rayyan‡ and Tatsu Takeuchi§
Institute for Particle Physics and Astrophysics, Physics Department, Virginia Tech, Blacksburg, Virginia 24061, USA

L. C. R. Wijewardhana**
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA

Received 31 March 2004; published 2 December 2004

In previous studies we found that models with flavor-universal suppression of the neutrino-gauge couplings are compatible with NuTeV and Z-pole data. In this paper we expand our analysis to obtain constraints on flavor-dependent coupling suppression by including lepton universality data from W, τ, π and K decays in fits to model parameters. We find that the data are consistent with a variety of patterns of coupling suppression. In particular, in scenarios in which the suppression arises from the mixing of light neutrinos with heavy gauge singlet states (neutrissimos), we find patterns of flavor-dependent coupling suppression which are also consistent with constraints from μ→eγ.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.70.113004
DOI:
10.1103/PhysRevD.70.113004
PACS:
14.60.St, 12.15.Lk, 13.15.+g, 14.60.Pq

*Electronic address: loinaz@alumni.princeton.edu

†Electronic address: nokamura@kias.re.kr

‡Electronic address: srayyan@vt.edu

§Electronic address: takeuchi@vt.edu

**Electronic address: rohana@physics.uc.edu

 
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