Factorisation in Colour Singlet Production
Jonathan Gaunt (CERN)

We rely heavily on factorisation formulae to make useful predictions at colliders such as the LHC. But when do such formulae work, and why? When do they not work? I will discuss this issue in the context of the production of a colour singlet V at hadronic colliders. Observables discussed include the total cross section for the production of V, p_T of V (including spin-dependent observables), and hadronic transverse energy E_T accompanying V. Based on arXiv:1405.2080 and arXiv:1709.04935.