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List of previous students

Nicola OrlandoFaten 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

NLO in SHERPA

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.