High Energy Theory Seminar: "Naturally Stabilizing the Weak Scale without Partners"

Mon, 01/29/2018 - 14:00
Devin Walker (Dartmouth College)

We generalize and adapt Veltman's condition to create a framework which naturally addresses the little hierarchy problem.  The resulting class of models is economical and ensures a minimum amount of fine-tuning for the bare Standard Model Higgs mass.  To demonstrate this framework, we provide a model with an extended Higgs sector and a top Yukawa coupling that is no longer unity.  The latter alleviates the largest radiative corrections to the Higgs mass.  The former features significant dimension-full couplings that generate, at best, logarithmic corrections to the Higgs masses.  The dimensionless couplings are small and do not generate large quadratic divergences or produce Landau poles.  We find the cutoff can be raised to 5-7 TeV without significant fine-tuning for a large region of parameter space.  We briefly discuss some of the phenomenology of the model and emphasize the importance of future $\bar{t}t h$ measurements.

David Rittenhouse Laboratory, 2N36