Magnetic moment of a massive neutrino due to its pion cloud

Details Magnetic moment of a massive neutrino due to its pion cloud Magnetic moment of a massive neutrino due to its pion cloud

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvd..70c3005t&link_type=abstract

Physical Review D, vol. 70, Issue 3, id. 033005

Physics

Neutrino Interactions, Electric And Magnetic Moments, Neutrino Mass And Mixing, Nuclear Matter Aspects Of Neutron Stars

Scientific paper

In this work we have calculated the magnetic moment μν of a massive neutrino, to one-pion loop order. If mν varies between ˜3 meV and ˜3 eV and mπ between 0 and ˜140 MeV one obtains values for μν which can compete with the Standard Model result in the chiral limit mπ→0. The photon coupling to the ππ-intermediate state leads to the presence of “chiral singularities” [m-1π- and log(mπ)-terms]. There are no such terms for the W-W+-intermediate state of the Standard Model. As a result μν is particularly sensitive to the mass ratios (mπ/ml,mνl/ml); this indicates to us that all electromagnetic properties of neutrinos (μν,, etc.) are expected to change significantly in a dense or hot medium. Such medium modifications of μν,, etc. are entirely due to the ππ-intermediate state which acts as a “doorway” state for the photon-neutrino coupling.

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