Beyond the standard Higgs
Professor Christophe Grojean, ICREA/IFAE, Barcelona, Spain
An elementary, weakly coupled and solitary Higgs boson allows to extend the validity of the Standard Model up to very high energy, maybe as high as the Planck scale. Nonetheless, this scenario fails to fill the universe with Dark Matter and do not explain the matter-antimatter asymmetry. However, amending the Standard Model tends to destabilize the weak scale by large quantum corrections to the Higgs potential. New degrees of freedom, new forces, new organizing principles are requested to provide a consistent and natural description of physics beyond the standard Higgs.
Searches beyond supersymmetry
Professor David Charlton, University of Birmingham, UK
The questions raised by the discovery of the light Higgs boson suggest new physics, and new particles, may be near to hand, at the energies now – and soon – being probed at the LHC. An extensive programme of searches for new particles is in place, exploring many possibilities. In the absence of definite predictions, the searches look at many and varied event types, hunting in numerous ways for deviations in the data from the background expectations from known processes.
Multiple solutions in supersymmetry and the Higgs
Professor Ben Allanach, University of Cambridge, UK
Searches for supersymmetric particles can be difficult to interpret. Here, we shall discuss the fact that, even given a well defined model of supersymmetry breaking with few parameters, there can be multiple solutions. These multiple solutions are physically different, and could potentially mean that points in parameter space have been ruled out by interpretations of LHC data when they shouldn't have been. We shall explain what such multiple solutions are, what they mean and why they haven't been discovered before. We shall illustrate their existence in the Constrained Minimal Supersymmetric Standard Model, although we expect them to be present in other scenarios too.
Searches for the supersymmetry
Professor Paris Sphicas, Athens/CERN, Greece
With the discovery of a Higgs boson at the LHC, the Standard Model (SM) of elementary particles and their interactions is now on rock-solid ground, providing an unfailing and remarkably accurate description of experiments with and without high-energy accelerators. With the physics of the very small thought to be understood at energy scales of at least 100 GeV, the situation is reminiscent of previous times in history when our knowledge of nature was deemed to be “complete”. There are hints that this may once more not be so: from astrophysical observations to theoretical calculations of the Higgs sector, there are several indications that some physics “beyond the SM” should exist. To this day, Supersymmetry (SUSY) remains one of the most popular extensions to the SM. A very significant effort has already been invested in searching for signs of the mirror world of particles hypothesized by SUSY, while the LHC experiments are currently carefully combing through their data samples looking for places where SUSY might be hiding. The talk will present a broad-brush picture of “the why, the what and the how” this search is carried out, along with the reasons for which the expectations are still so very high.