List of previous students

Nicola Orlando
Faten Hariri
Emma Kuwertz
Spyridon Argyropoulo
Sabrina Sacerdoti
Simone Amoroso
Jesper Roy Christiansen
Nathan Hartland
Christian Roehr
Benjamin Watt
Philip Ilten
Nishita Desai
Sercan Sen
Miroslav Myska
Sudha Ahuja
Holger Schulz
Avi Gershan
Aleksander Kusina
Magdalena Slawinska
Flavia Dias
Kenneth Wraight
Irais Bautista Guzman
Sparsh Navin
Paolo Francavilla
Riccardo Di Sipio
Seyi Latunde-Dada
Devdatta Majumder
Martijn Gosselink
Christopher Bignamini
Marek Schönherr
Michal Deak
Noam Hod
Florian Bechtel
Jonathan Ferland
Manuel Bähr
Alexander Flossdorf
Piergiulio Lenzi

Marek Schönherr is a PhD student from the Technical University of Dresden on a four-month MCnet studentship in Durham.

Detailed theoretical predictions are needed for experimental analyses at most present and future collider experiments. This involves differential and inclusive signal and background cross-section predictions of known theories like the Standard Model or candidate theories like the Minimal Supersupersymmetric Extension to the Standard Model (MSSM) and others. These predictions are usually estimated using Monte Carlo Event Generators.

These Monte Carlo Generators factorise each event into a hard part, which can be evaluated perturbatively, and soft parts surrounding the hard process. So far, most of these all-purpose Monte Carlo Generators only use tree-level matrix elements for their perturbative physics models. These tree-level matrix elements are often not sufficient to give a reliable estimate. In particular in the context of strong interactions or QCD. Here, due to the large numerical value of alpha_S, higher order corrections can give significant contributions to the full result and, thus, cannot be neglected. To carry out sensible phenomenological analyses these higher order corrections need to be implemented in a Monte Carlo Generator capable of simulating not only the hard partonic interaction but also the soft physics surrounding this hard process and, thus, turning these NLO-quantities into experimentally accessible observables.

During my stay in Durham we are working on the implementation of next-to-leading order (NLO) radiative corrections to signal processes into the Monte Carlo Event Generator SHERPA. While the SHERPA Event Generator is already capable of automatically generating tree level matrix elements, needed for the born level process and the real emission corrections, as well as integrated and unintegrated dipole subtraction terms, the virtual one loop correction matrix elements currently have to be calculated manually. To this end, a generic library of the most important 1 to 2 and 2 to 2 matrix elements is created as well as tools to easily implement new ones. Also an algorithm to generate unweighted events needed for experimental analyses is implemented.