Speaker
Description
Measurements of vector boson (VB) polarisation in VB production processes offer a powerful probe of the electroweak symmetry breaking mechanism, scrutinising the Standard Model and new physics scenarios alike. Since massive VBs can only be observed as intermediate particles, polarised cross section templates from simulation are necessary to extract their polarisation from measurable unpolarised distributions. In this work we present an extension of the SHERPA Monte-Carlo event generator, allowing the simulation of polarised cross sections for VB production processes. Based on the narrow-width approximation, polarised cross sections of all possible polarisation combinations including the interference between different intermediate polarisation states for an arbitrary number of intermediate VBs can be simulated in a single simulation run. Besides polarised cross sections at fixed LO and LO+PS accuracy as well as in multi-jet merged calculations, we also present parton-shower-matched polarised cross sections with approximate NLO QCD corrections in the VB production processes.
