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The possibility that the accurately known value of the Z width might furnishinformation about the coupling of two neutrinos to the Majoron (Nambu-Goldstoneboson of spontaneous lepton number violation) is proposed and investigated indetail. Both the "ordinary" case and the case in which one adopts a "brane"world picture with the Majoron free to travel in extra dimensions are studied.Bounds on the dimensionless coupling constants are obtained, allowing for anynumber of extra dimensions and any intrinsic mass scale. These bounds may beapplied to a variety of different Majoron models. If a technically naturalsee-saw model is adopted, the predicted coupling constants are far below theseupper bounds. In addition, for this natural model, the effect of extradimensions is to decrease the predicted partial Z width, the increase due tomany Kaluza-Klein excitations being compensated by the decrease of their commoncoupling constant.Comment: RevTeX, 12 pages, 3 figure

PossibleZ-width probe of a “brane-world” scenario for neutrino masses