A three-family standard-like orientifold model: Yukawa couplings and hierarchy

Mirjam Cvetič, Paul Langacker, Gary Shiu

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


We discuss the hierarchy of Yukawa couplings in a supersymmetric three family standard-like string model. The model is constructed by compactifying type IIA string theory on a Z2 × Z2 orientifold in which the standard model matter fields arise from intersecting D6-branes. When lifted to M-theory, the model amounts to compactification of M-theory on a G2 manifold. While the actual fermion masses depend on the vacuum expectation values of the multiple Higgs fields in the model, we calculate the leading worldsheet instanton contributions to the Yukawa couplings and examine the implications of the Yukawa hierarchy.

Original languageEnglish (US)
Pages (from-to)139-156
Number of pages18
JournalNuclear Physics B
Issue number1-2
StatePublished - Oct 21 2002

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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