Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-11
JHEP0709:113,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
38 pages. v2: Typos corrected
Scientific paper
10.1088/1126-6708/2007/09/113
We construct a 6D supergravity theory which emerges as intermediate step in the compactification of the heterotic string to the supersymmetric standard model in four dimensions. The theory has N=2 supersymmetry and a gravitational sector with one tensor and two hypermultiplets in addition to the supergravity multiplet. Compactification to four dimensions occurs on a T^2/Z_2 orbifold which has two inequivalent pairs of fixed points with unbroken SU(5) and SU(2)xSU(4) symmetry, respectively. All gauge, gravitational and mixed anomalies are cancelled by the Green-Schwarz mechanism. The model has partial 6D gauge-Higgs unification. Two quark-lepton generations are localized at the SU(5) branes, the third family is composed of split bulk hypermultiplets. The top Yukawa coupling is given by the 6D gauge coupling, all other Yukawa couplings are generated by higher-dimensional operators at the SU(5) branes. The presence of the SU(2)xSU(4) brane breaks SU(5) and generates split gauge and Higgs multiplets with N=1 supersymmetry in four dimensions. The third generation is obtained from two split \bar{5}-plets and two split 10-plets, which together have the quantum numbers of one \bar{5}-plet and one 10-plet. This avoids unsuccessful SU(5) predictions for Yukawa couplings of ordinary 4D SU(5) grand unified theories.
Buchmüller Wilfried
Ludeling Christoph
Schmidt Jonas
No associations
LandOfFree
Local SU(5) Unification from the Heterotic String does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Local SU(5) Unification from the Heterotic String, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local SU(5) Unification from the Heterotic String will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-435263