Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-01-04
Phys.Lett. B531 (2002) 231-236
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 5 figures, elsart format
Scientific paper
10.1016/S0370-2693(02)01494-6
It is shown that the rare decays $Z \to \nu \bar{nu} \gamma$ and $Z \to \nu \bar{\nu} \gamma \gamma$ are useful to put model-independent bounds on neutrino-one-photon and neutrino-two-photon interactions. The results are then used to constrain the $\tau$ neutrino magnetic moment and the double radiative decay $\nu_j \to \nu_i \gamma \gamma$. It is found that the decay $Z \to \nu \bar{nu} \gamma$ gives a more stringent bound on the $\tau$ neutrino magnetic moment than that obtained from $Z \to \nu \bar{\nu} \gamma \gamma$; the latter decay in turn gives limits on the neutrino-two-photon interaction that are less stringent than those obtained for a sterile neutrino $\nu_s$ from the analysis of $\nu_\mu N \to \nu_s N$ conversion.
Larios Francisco
Perez Anisa M.
Tavares-Velasco G.
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