@article{deee1cc4822645468870de4ec256806e,

title = "A three-family standard-like orientifold model: Yukawa couplings and hierarchy",

abstract = "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.",

author = "Mirjam Cveti{\v c} and Paul Langacker and Gary Shiu",

note = "Funding Information: We are especially grateful to Angel Uranga for many discussions and collaboration at an early stage. We would also like to thank Jing Wang for useful discussions and collaborations on related work. This work was supported by the DOE grants EY-76-02-3071 and DE-FG02-95ER40896; by the National Science Foundation Grant No. PHY99-07949; by the University of Pennsylvania School of Arts and Sciences Dean's fund (M.C. and G.S.) and Class of 1965 Endowed Term Chair (M.C.); by the University of Wisconsin at Madison (P.L.); by the W.M. Keck Foundation as a Keck Distinguished Visiting Professor at the Institute for Advanced Study (P.L.). We would also like to thank ITP, Santa Barbara, during the “Brane World” workshop (M.C., P.L. and G.S.), and the Isaac Newton Institute for Mathematical Sciences, Cambridge, during the M-theory workshop (M.C.), for hospitality during the course of the work. ",

year = "2002",

month = oct,

day = "21",

doi = "10.1016/S0550-3213(02)00684-3",

language = "English (US)",

volume = "642",

pages = "139--156",

journal = "Nuclear Physics B",

issn = "0550-3213",

publisher = "Elsevier",

number = "1-2",

}