The end of the first 7 TeV and 8 TeV runs of the LHC have left us with two significant discoveries. The first discovery is of the 126 GeV Higgs boson. This has sharpened our views of nature, placed added emphasis on perturbative theories with low-mass Higgs boson, and abolished the many ideas that had no Higgs boson in the spectrum. The second discovery is that there are no obvious and strong signals of exotic new physics beyond the standard model below this energy scale. This is unexpected since it was assumed that low-mass new physics is required to naturally accommodate the gauge hierarchy. The lack of definitive evidence for new physics and the variety of theoretical possibilities suggests the need to carefully reexamine questions such as the likely scales of new physics and how to look for them at the LHC and at other present and future facilities. The two-year period before the LHC turns on again at higher energy affords the particle physics community an opportunity for such a reevaluation.
Application deadline: 28 February, 2014
I will discuss the current status of the light neutralino dark matter scenario within the minimal supersymmetric standard model (MSSM) taking into account latest results from the LHC.
Constraints from the dark matter relic abundance lead us to a manageable simplified model defined by a subset of MSSM parameters, within which we could reinterpret recent searches for electroweak supersymmetric particle production based on events with multi-tau plus missing transverse momentum, performed by the ATLAS collaboration. In this way we could derive stringent constraints on the light neutralino parameter space. In combination with further experimental information from the LHC, in particular the bounds on possible invisible Higgs decays, we obtained a lower bound on the lightest neutralino that is stronger than any current limit set by underground direct dark matter searches or indirect detection experiments.
Top quark and new physics
EFT approach to Flavour and Dark Matter
In this talk I review the effective field theory approach to physics
beyond the SM. The effect of new physics can be incorporated in higher
dimensional operators which must respect the SM gauge symmetries. As an
application I discuss the effects of dim-6 operators in LFV observables
and the determination of the CKM elements. This approach can be easily
extended to include DM. Here I discuss the RGE evolution of the effective
operators assuming that DM is a SM singlet.
Dark matter, black holes, and the Fermi GeV excess
The excess of GeV-scale photons observed by the Fermi
telescope in the direction of the Galactic Centre is strikingly
similar in both rate and spatial distribution to the expectations for
annihilating dark matter. I'll discuss dark matter models that can
reconcile the Fermi signal with the lack of signals from direct
detection and collider experiments. If the Fermi signal is indeed due
to dark matter, then the Milky Way's super-massive black hole should
give rise to an additional point-source like contribution to the gamma
ray signal. The canonical expectation for this point-like source is
incompatible with Fermi measurements of the Galactic Centre, and I'll
talk about possible astrophysical and particle consequences of this
A Powerful Probe of New Neutrino Currents
Recent results on electroweak measurements and searches for new physics at the LHC
Emerging Jets From a Dark Sector
I will discuss a few reasons to go beyond minimal dark matter models,
and some theoretical ideas that motivate us to consider a QCD-like
dark sector. One characteristic signature of such dark sectors are
"emerging jets" that can be reconstructed in the calorimeter but leave
few hits in the inner trackers. We propose a new strategy to search
for these emerging jets, using their "trackless" feature to
discriminate from QCD background. Compared to ordinary multi-jet
resonance searches, the sensitivity can be increased by four orders of
magnitude or more.