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New Biasing Method for Variance Reduction of Compton Events in GEANT4

Student: 
Sunil Kumar
Date: 
July, 2019 to October, 2019
Sunil Kumar is a Ph.D. student at Panjab University, India, on a three-month MCnet studentship in Durham. The project was in the collaboration of Durham University and IBEX Innovations Ltd. The aim of the studentship was to develop a biasing method which can be used to reduce the variance of low and high angle Compton scattered events from a pencil beam of X-rays interacting with a sample.

Identification of B-jets for Z and Higgs boson measurements

Student: 
Peter Bokan
Date: 
June, 2016 to November, 2016
During the MCnet studentship I studied effects of gluon splitting to b-quark and its antiquark on event identification for several processes with Z or Higgs boson (h) decaying to bb. The objective was to evaluate how often gluon jets are identified as b-jets, what is the impact of this on Z/h boson reconstruction, and how this misidentification can be prevented. Different variables, expected to distinguish well between gluon jets and b-jets, were tested, both separately and combined, and good performance has been shown.

Subleading Colour Corrections in parton showers

Student: 
Johan Thoren
Date: 
May, 2016 to August, 2016
In this project an algorithm for including subleading colour corrections in a parton shower has been reimplemented and extended to include parton-parton events in Herwig. With this Herwigs dipole shower can now correct any number of emissions for subleading colour and then continue showering using the leading colour approximation. The most obvious use of this is for studying observables sensitive to these corrections, for example gap cross sections at hadron colliders, and to find new observables where this effect is important.

NLO parton shower algorithms and Herwig++

Student: 
Aleksander Kusina
Date: 
March, 2010 to June, 2010
During my short-term studentship I was working on the possibilities of the construction of the full NLO Parton Shower MC. In particular on the possibilities of implementing some of the ideas we have in the group of Prof. S. Jadach (IFJ PAN Krakow) within the framework of the Herwig++. During my stay I submitted one paper for publication: A. Kusina, S. Jadach, M. Skrzypek, M. Slawinska, Acta Phys. Polon. B41 (2010) 1683, arxiv.org:1004.4131.

NLO in SHERPA

Student: 
Marek Schönherr
Date: 
October, 2008 to January, 2009
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.