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How Magnetic is the Dirac Neutrino?
Nicole F Bell1, V Cirigliano, M J Ramsey-Musolf
1California Institute of Technology, Pasadena, California 91125, USA.
Physical Review Letters
|October 26, 2005
Summary
We established new upper limits on the magnetic moments of Dirac neutrinos, derived from current neutrino mass data. This finding provides a stronger constraint than previously available from astrophysical and experimental observations.
Area of Science:
- Particle Physics
- Cosmology
- Astrophysics
Background:
- Neutrino magnetic moments are sensitive probes of new physics beyond the Standard Model.
- Understanding neutrino properties requires exploring physics at high energy scales, such as electroweak symmetry breaking.
Purpose of the Study:
- To derive model-independent upper bounds on Dirac neutrino magnetic moments.
- To investigate the implications of current neutrino mass data for these magnetic moments.
Main Methods:
- Utilizing "naturalness" criteria and effective field theory.
- Analyzing existing experimental and observational data on neutrino masses.
Main Results:
- A model-independent upper bound on neutrino magnetic moments was derived.
- This bound is significantly stronger (several orders of magnitude) than current experimental and astrophysical limits.
Conclusions:
- Current neutrino mass measurements impose stringent constraints on new physics scenarios.
- The derived bound on neutrino magnetic moments surpasses those from solar, reactor, and astrophysical data.