Possible Z-width probe of a "brane-world" scenario for neutrino masses

S. Moussa, S. Nasri, F. Sannino, J. Schechter

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The possibility that the accurately known value of the Z width might furnish information about the coupling of two neutrinos to the Majoron (Nambu-Goldstone boson of spontaneous lepton number violation) is proposed and investigated in detail. 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 any number of extra dimensions and any intrinsic mass scale. These bounds may be applied to a variety of different Majoron models. If a technically natural seesaw model is adopted, the predicted coupling constants are far below these upper bounds. In addition, for this natural model, the effect of extra dimensions is to decrease the predicted partial Z width, the increase due to many Kaluza-Klein excitations being compensated by the decrease of their common coupling constant.

Original languageEnglish
Article number096003
Pages (from-to)960031-960038
Number of pages8
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9 B
Publication statusPublished - May 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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