Particle and Astro-Particle Physics Seminars

# Naturalness after the first run of the LHC

## by Marco Farina (Cornell University)

Friday, 10 January 2014 from to (Europe/Zurich)
at CERN ( 4-3-006 - TH Conference Room )
 Description The naturalness principle is under serious scrutiny after the discovery of a 126 SM-like Higgs boson and the lack of new physics signals at the LHC. In this talk I will show how the measurement of the Higgs couplings can be used as a probe of naturalness and how deviations from SM behaviour are in general inversely correlated with the amount of fine-tuning. I will give two examples of such correlation. First in the case of an extended scalar sector, I will study the large-lambda version of the Next-to-Minimal Supersymmetric Standard Model. Then, in a model independent approach, I will point out the generic correlation between naturalness and the size of top partner loop contributions to Higgs couplings to photons and gluons. Finally I will discuss a modification of the usual criterion for naturalness and its consequences.