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Institute for Particle Physics Phenomenology Logo

Institute for Particle Physics Phenomenology

Durham University Logo Institute for Particle Physics Phenomenology Logo

Institute for Particle Physics Phenomenology

Congratulations to Alan Price who officially received his PhD! His thesis titled "Precision Simulations for Future Colliders" is attached to this news item and the abstract can be read in the full text. We wish him all the best for his post-doctoral position in Siegen.

Future particle colliders will usher in a new era of precision physics. It will be crucial that the theory community can provide highly precise predictions for these experiments. In particular, for future e+e− colliders the theoretical calculations
will need to improve by a factor 2-100, depending on the observable. In this thesis, we will present the theoretical improvements implemented in the SHERPA event generator for e+e− physics. We will concentrate on the treatment of QED radiation
within the framework of Yennie, Frautschi and Suura resummation and discuss its impact on future colliders. In particular, we shall show how initial state radiation can be resummed in a process-independent manner to all orders in the QED coupling.
We find that the resummation alone is not sufficient, and the inclusion of fixed-order corrections improves the perturbative description substantially. We will apply these
corrections to the study of e+e− → ffbar, e+e− → W+W− and e+e− → ZH processes at a future lepton-lepton collider, and discuss the impact of the QED corrections.
In the second part of this thesis we will consider precision calculation of W/Z+jet at a future hadron-hadron colliders, namely the HE-LHC/FCC-hh. The theoretical
modelling of these processes is crucial for controlling the background in many beyond the standard model searches. The processes are calculated up to next-to-next
leading-order in the QCD coupling αs. A detailed and robust study of the associated scale and shape uncertainties is presented.

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