Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-07-31
Nucl.Phys.B776:118-137,2007
Physics
High Energy Physics
High Energy Physics - Theory
38 pages, 2 figures Minor corrections, references added
Scientific paper
10.1016/j.nuclphysb.2007.03.008
We construct new supersymmetric SU(5) Grand Unified Models based on Z4 x Z2 orientifolds with intersecting D6-branes. Unlike constructions based on Z2 x Z2 orientifolds, the orbifold images of the three-cycles wrapped by D6-branes correspond to new configurations and thus allow for models in which, in addition to the chiral sector in 10 and 5-bar representations of SU(5), only, there can be new sectors with (15 + 15-bar) and (10 + 10-bar) vector-pairs. We construct an example of such a globally consistent, supersymmetric model with four-families, two Standard Model Higgs pair-candidates and the gauge symmetry U(5) x U(1) x Sp(4). In a N = 2 sector, there are 5 x (15 + 15-bar) and 1 x (10 + 10-bar) vector pairs, while another N = 1 sector contains one vector-pair of 15-plets. The N = 2 vector pairs can obtain a large mass dynamically by parallel D6-brane splitting in a particu- lar two-torus. The 15-vector-pairs provide, after symmetry breaking to the Standard Model (via parallel D-brane splitting), triplet pair candidates which can in principle play a role in generating Majorana- type masses for left-handed neutrinos, though the necessary Yukawa couplings are absent in the specific construction. Similarly, the 10- vector-pairs can play the role of Higgs fields of the flipped SU(5), though again there are phenomenological difficulties for the specific construction.
Cvetic Mirjam
Langacker Paul
No associations
LandOfFree
New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5) 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 New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Grand Unified Models with Intersecting D6-branes, Neutrino Masses, and Flipped SU(5) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-33390