Unification and Fermion Mass Structure

Details Unification and Fermion Mass Structure Unification and Fermion Mass Structure

2007-04-10

arxiv.org/abs/0704.1248v2

Phys.Lett.B664:97-102,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, added references and comments on GUT thresholds

Scientific paper

10.1016/j.physletb.2008.05.014

Grand Unified Theories predict relationships between the GUT-scale quark and lepton masses. Using new data in the context of the MSSM, we update the values and uncertainties of the masses and mixing angles for the three generations at the GUT scale. We also update fits to hierarchical patterns in the GUT-scale Yukawa matrices. The new data shows not all the classic GUT-scale mass relationships remain in quantitative agreement at small to moderate tan beta. However, at large tan beta, these discrepancies can be eliminated by finite, tan beta-enhanced, radiative, threshold corrections if the gluino mass has the opposite sign to the wino mass.

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