Oct 2021 - Sept 2022
# Internal seminar by Wendy Gray

→
Europe/London

OC218
### OC218

Description

**Numerical 6D spinor helicity methods for NLO gg -> higgs + jets**

Abstract:** **Monte-Carlo tools including Sherpa calculate cross-sections but need virtual matrix elements to be supplied: these calculations can be a bottleneck. Gluon fusion is the primary production mode for the Higgs boson at LHC, and the main source of backgrounds comes from multi-jet final states. Feynman diagram approaches to multi-jet final states suffer from rapid growth in the number of diagrams and this restricts the number of jets that can be calculated. At present, the primary source of virtual matrix elements for gg -> higgs + jets uses Feynman diagrams. In this seminar we address the question: is it possible to use 6D spinor helicity methods to set up a new, numerical framework for the NLO virtual contribution to gg -> higgs that can be scaled for arbitrarily high multiplicity jets?

**Self-organised criticality and general relativity - suggestions for an inter-disciplinary approach to dark matter**

Self-organised criticality (SOC) is a sub-field of non-equilibrium statistical mechanics which is specifically suited to many-body, interacting systems with multiple degrees of freedom. General relativity (GR) is the most complete theory of gravity available, but it is usually replaced by the Newtonian approximation in calculations at the scale of galaxies and galaxy clusters. We demonstrate that the SOC paradigm and GR together suggest additional approaches to dark matter research.

Zoom Meeting ID: 994 2012 4988