arxiv ref: 1411.4652Title: Interference effects in BSM processes with a generalised narrow-width approximationAuthors: E. Fuchs, S. Thewes, G. WeigleinNode: DESYSupervisor: WeigleinWork Packages: WP1: Interpretation of DataMilestones: M1.3.1 Constraints on physics beyond the SM, distinction between different models