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Kollokviumaira:


                        2016 június 2, csütörtök, 15 óra

                            Tania Robens, TU Dresden


Particle Physics after the Higgs Discovery: Questions and Challenges in the 
LHC era



Abstract:
With the start of data taking at the LHC in 2009 and its more than successful 
physics program since then, particle physics has entered an exciting era. After
the discovery of a Higgs boson, a major task within the high-energy community 
is now the exact determination of its properties, which in turn calls for 
both accurate experimental measurements as well as precise theoretical 
predictions. While current measurements are well in agreement with predictions 
from the Standard Model (SM) alone, both theoretical as well as experimental 
uncertainties still allow for interpretation in models which extend the 
particle sector of the SM.

In my talk, I will focus on two areas of research of high relevance to the LHC 
physics program. The first concerns the inclusion of higher-order corrections 
into Monte Carlo event generators, which are a necessary ingredient for the 
direct comparison between theoretical predictions and experimental data. I 
will specifically discuss the treatment of infrared singularities. Numerical 
implementations of these divergent terms need to be treated with great care to 
avoid instabilities. A common tool for this are subtraction schemes. I have 
developed a new scheme for such subtractions and will discuss its properties 
as well as advantages over alternative schemes. I will also discuss the 
calculation of higher-order corrections to the process WW+jet using analytic 
methods.

A second part of my research deals with models that extend the particle 
content
of the SM. I will discuss possible extensions of the SM Higgs sector, with a 
special focus on the singlet extension, where an additional spin-0 particle is 
added to the Higgs potential. This model, which is subject to both theoretical 
as well as experimental bounds, currently serves as an important benchmark 
scenario for LHC experimental searches. I will discuss the currently available 
bounds within this model as well as the discovery prospects for the additional 
particle at the LHC experiments.




*******

                        2016 június 6, hétfő, 15 óra

   Georgios Georgiou, Institute of Nuclear and Particle Physics, Athens


   Observables at weak and strong coupling from gauge/gravity dualities.



Abstract:
Abstract: In recent years, significant progress has been made in the 
calculation of scattering amplitudes, the spectrum and of higher point 
correlation functions in supersymmetric gauge theories for any value of the 
coupling.
The role of gauge/gravity dualities in these calculations was instrumental.
We will review part of this progress and also discuss future directions.