1993/08/04 by Darwin Chang, Jiang Liu, Chang, Darwin +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9308224
(7 pages LATEX) 5 pages of figures can be sent on request. [NUHEP-TH-93-17, UPR-0576T, DOE-ER40757-019, CPP-93-19]
arxiv created 1993/08/04 · arxiv updated 2009/11/30
In models where the suppression of the tree level couplings of fermions with Goldstone bosons is not protected by symmetry, the loop-induced couplings can in general dominate over the tree couplings. We demonstrate this by calculating the decay ν→ ν' + Majoron in the simplest singlet Majoron model. It is shown that 1-loop contributions can be orders of magnitude bigger than the tree-level result, and hence allows a wide range of interesting values of neutrino mass and mixing to be compatible with cosmological constraints.