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Neutrino Mass Constraints on µ Decay and pi0-->nu[overline nu]

Prézeau, Gary and Kurylov, Andriy (2005) Neutrino Mass Constraints on µ Decay and pi0-->nu[overline nu]. Physical Review Letters, 95 (10). Art. No. 101802. ISSN 0031-9007. doi:10.1103/PhysRevLett.95.101802.

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In this Letter, we show that upper limits on the neutrino mass translate into upper limits on the class of neutrino-matter interactions that can generate loop corrections to the neutrino mass matrix. We apply our results to µ and pi decays and derive model-independent limits on six of the ten parameters used to parametrize contributions to µ decay that do not belong to the standard model. These upper limits provide improved constraints on the five Michel parameters, rho,xi[prime],xi[prime][prime],alpha,alpha[prime], that exceed Particle Data Group constraints by at least one order of magnitude. For pi0-->nu[overline nu] we find, for the branching ratio, B(pi0-->nu[overline nu])<10^-10.

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Additional Information:©2005 The American Physical Society (Received 15 September 2004; published 1 September 2005) The authors are grateful to Petr Vogel for very useful discussions and observations. The authors also thank D. Bryman, S. Kettell, S. Pastor, R. Shrock, and A. Yu Smirnov for useful comments.
Subject Keywords:neutrino mass; neutrino oscillations; neutrino interactions; pion decay; meson leptonic decay; muon decay; pions
Issue or Number:10
Record Number:CaltechAUTHORS:PREprl05b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2345
Deposited By: Archive Administrator
Deposited On:28 Mar 2006
Last Modified:08 Nov 2021 19:47

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