Martin Spinrath
Speaker affiliation: 
SISSA Trieste, Italy
Friday, January 18, 2013 - 16:15
Building 44 (Shackleton) Lecture Theatre B
Natural GUT scale mass ratios (CANCELLED!!! But talk is online.)

In my talk I will focus on two different kind of masses and discuss
their naturalness. First, I will discuss ratios of fermion masses like
the tau and the bottom mass at the SUSY GUT scale. These ratios are
predicted in minimal GUT setups, but recent data hints that nature has
chosen a more complicated setup. I will present alternatives and also
show that these alternatives can be used to generate a sizeable theta_13
in the neutrino sector. Then I will focus on the little hierarchy
problem and discuss naturalness in the MSSM. It turns out that even
after the Higgs discovery there are still regions with an acceptable
amount of fine-tuning allowed assuming non-universal gaugino masses at
the GUT scale.