An Exclusive Window onto Higgs Yukawa Couplings

• Jure Zupan

Room: MITP seminar room

Probing light Neutralino Dark Matter at the LHC

• Lorenzo Callibi

Room: MITP seminar room 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

• Lucia Masetti

Room: MITP seminar room

EFT approach to Flavour and Dark Matter

• Andreas Crivellin

Room: MITP seminar room 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

• Jessie Shelton

Room: MITP seminar room 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 observation.

A Powerful Probe of New Neutrino Currents

• Itay Yavin

Room: MITP seminar room

Recent results on electroweak measurements and searches for new physics at the LHC

• Frank Ellinghaus

Room: MITP seminar room

Emerging Jets From a Dark Sector

• Pedro Schwaller

Room: MITP seminar room 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.