TY - JOUR

T1 - Realistic four-generation MSSM in Type II string theory

AU - Belitsky, Andrei

AU - Lebed, Richard

AU - Mayes, Van E.

N1 - Funding Information:
We thank Gary Shiu for reading the manuscript and for helpful advice, and Tianjun Li for helpful discussions involving four-generation models. This work was supported by the National Science Foundation under Grant No. PHY-0757394 .

PY - 2011/3/14

Y1 - 2011/3/14

N2 - We construct a four-generation MSSM with rank-4 Yukawa matrices from intersecting D6 branes on a T6/(Z2×Z2) orientifold. The Yukawa matrices obtained provide an example of Flavor Democracy (FD), where the Yukawa couplings are all nearly equal. Mass hierarchies may then be generated by slight perturbations away from FD. We find that it is possible to obtain hierarchical masses for the quarks and leptons of each generation and mixings between them. In addition, the tree-level gauge couplings are unified at the string scale. Finally, we also construct similar models with one, two, and three generations in which the rank of the Yukawa matrices is equal to the number of generations in each model.

AB - We construct a four-generation MSSM with rank-4 Yukawa matrices from intersecting D6 branes on a T6/(Z2×Z2) orientifold. The Yukawa matrices obtained provide an example of Flavor Democracy (FD), where the Yukawa couplings are all nearly equal. Mass hierarchies may then be generated by slight perturbations away from FD. We find that it is possible to obtain hierarchical masses for the quarks and leptons of each generation and mixings between them. In addition, the tree-level gauge couplings are unified at the string scale. Finally, we also construct similar models with one, two, and three generations in which the rank of the Yukawa matrices is equal to the number of generations in each model.

KW - D-branes

KW - MSSM

KW - String phenomenology

KW - String theory

UR - http://www.scopus.com/inward/record.url?scp=79960096595&partnerID=8YFLogxK

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U2 - 10.1016/j.physletb.2011.02.022

DO - 10.1016/j.physletb.2011.02.022

M3 - Article

AN - SCOPUS:79960096595

VL - 697

SP - 343

EP - 350

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 4

ER -