Unification and Fermion Mass Structure

Understand

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.