Can String Theory Predict the Weinberg Angle?
| dc.creator | Raby, S. | |
| dc.creator | Wingerter, A. | |
| dc.date | 2007-06-01 | |
| dc.date.accessioned | 2026-07-07T10:56:00Z | |
| dc.date.available | 2026-07-07T10:56:00Z | |
| dc.description | We investigate whether the hypercharge assignments in the Standard Model can be interpreted as a hint at Grand Unification in the context of heterotic string theory. To this end, we introduce a general method to calculate U(1)_Y for any heterotic orbifold and compare our findings to the cases where hypercharge arises from a GUT. Surprisingly, in the overwhelming majority of 3-2 Standard Models, a non-anomalous hypercharge direction can be defined, for which the spectrum is vector-like. For these models, we calculate sin^2 theta to see how well it agrees with the standard GUT value. We find that 12% have sin^2 theta = 3/8, while all others have values which are less. Finally, 89% of the models with sin^2 theta = 3/8 have U(1)_Y in SU(5). | |
| dc.description | 35 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/0706.0217 | |
| dc.identifier | http://arxiv.org/abs/0706.0217 | |
| dc.identifier | Phys.Rev.D76:086006,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.086006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/186268 | |
| dc.subject | High Energy Physics - Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Can String Theory Predict the Weinberg Angle? | |
| dc.type | text |