Yukawa couplings in degenerate orbifolds: towards a realistic SU(3)×SU(2)×U(1) superstring

A. Font, L. E. Ibáñez, H. P. Nilles, F. Quevedo

Research output: Contribution to journalArticlepeer-review


We discuss the construction of SU(3)×SU(2)×U(1) three-generation superstrings through the "degenerate orbifolds" recently described by the authors. These are lower rank models continuosly connected to rank-sixteen or twenty-two models through flat directions in the potential of the scalar fields. The structure of Yukawa couplings is carefully investigated and special attention is paid to nonrenormalizable interactions in determining the flat directions and the induced cubic couplings that are forbidden in the original model. The importance of twisted oscillator modes and moduli to this effect is explained. One specific example is presented in detail and its phenomenological consequences such as quark and lepton masses, proton stability and neutrino masses are discussed. In this example there are built-in "stringy" symmetries that protect Higgs doublets from getting large tree-level masses.

Original languageEnglish (US)
Pages (from-to)101-112
Number of pages12
JournalPhysics Letters B
Issue number1-2
StatePublished - Aug 18 1988

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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