Related Experiment Video
Updated: Aug 15, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Neutrino mass constraints on mu decay and pi0--> nunu
1Jet Propulsion Laboratory/California Institute of Technology, Pasadena, 91109, USA.
Abstract:
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 mu and pi decays and derive model-independent limits on six of the ten parameters used to parametrize contributions to mu decay that do not belong to the standard model. These upper limits provide improved constraints on the five Michel parameters, rho, xi', xi", alpha, alpha', that exceed Particle Data Group constraints by at least one order of magnitude. For pi(0) --> nunu we find, for the branching ratio, B(pi(0) --> nunu) < 10(-10).
Related Concept Videos
Subatomic Particles
Nuclear Binding Energy
Nuclear Stability
To hold positively charged protons together in the...
Radioactivity and Nuclear Equations
A nuclide of an element has a specific number of protons and...
Nuclear Transmutation
Atomic Nuclei: Nuclear Magnetic Moment

