Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-11-25
Phys.Lett.B683:340-348,2010
Physics
High Energy Physics
High Energy Physics - Theory
16 pages
Scientific paper
10.1016/j.physletb.2009.12.036
We present a Z_2 x Z_2 orbifold compactification of the E_8 x E_8 heterotic string which gives rise to the exact chiral MSSM spectrum. The GUT breaking SU(5) to SU(3)_C x SU(2)_L x U(1)_Y is realized by modding out a freely acting symmetry. This ensures precision gauge coupling unification. Further, it allows us to break the GUT group without switching on flux in hypercharge direction, such that the standard model gauge bosons can remain massless when the orbifold singularities are blown up. The model has vacuum configurations with matter parity, a large top Yukawa coupling and other phenomenologically appealing features.
Blaszczyk Michael
Nibbelink Stefan Groot
Ratz Michael
Ruehle Fabian
Trapletti Michele
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