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The decay Z -> neutrino antineutrino photon in the Standard Model
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The decay Z -> neutrino antineutrino photon in the Standard Model
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A complete study of the one-loop induced decay Z -> neutrino antineutrino photon is presented within the framework of the Standard Model. The advantages of using a nonlinear gauge are stressed. We have found that the main contributions come from the electric dipole and the magnetic dipole transitions of the Z gauge boson and the neutrino, respectively. We obtain a branching ratio B=7.16E-10, which is about four orders of magnitude smaller than the bound recentely obtained by the L3 collaboration and thus it leaves open a window to search for new physics effects in single-photon decays of the Z boson.
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Cited by 1 Pith paper
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Search for new physics effects in $\nu\bar{\nu}\gamma$ production at a Tera-Z factory
A cut-based analysis of e+e−→ννγ at a Tera-Z factory is projected to constrain BR(Z→ννγ) to about 2×10^-9 (3σ, no systematics), an order-3 improvement over LEP but above the SM value 7.2×10^-10.
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