Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-05
Phys.Rev. D64 (2001) 055009
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages
Scientific paper
10.1103/PhysRevD.64.055009
We consider models of anomaly-mediated supersymmetry breaking (AMSB) in which the grand unification (GUT) scale is determined by the vacuum expectation value of a chiral superfield. If the anomaly-mediated contributions to the potential are balanced by gravitational-strength interactions, we find a model-independent prediction for the GUT scale of order $M_{\rm Planck} / (16\pi^2)$. The GUT threshold also affects superpartner masses, and can easily give rise to realistic predictions if the GUT gauge group is asymptotically free. We give an explicit example of a model with these features, in which the doublet-triplet splitting problem is solved. The resulting superpartner spectrum is very different from that of previously considered AMSB models, with gaugino masses typically unifying at the GUT scale.
Chacko Zackaria
Luty Markus
Ponton Eduardo
Shadmi Yael
Shirman Yuri
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