Characterizing long-lived particles at forward-physics experiments in the presence of a signal excess

As modern-day constraints on new physics continue to improve, interest in BSM models with light and feebly interacting particles which can avoid these constraints has grown considerably. The hunt for these long-lived particles spans a large plethora of experiments, from lab/collider based experiments to astrophysical or cosmological signatures. In the event that a new physics signal is actually detected, it can be expected that several of these experiments should observe an appreciable signal excess. In this talk, we will use monte-carlo simulations of LLPs to illustrate how the unique measurement capabilities of different forward-physics experiments can be combined to estimate the model parameters of LLPs, such as the LLP mass or interaction strength, with improved precision. Additionally, we will discuss how these techniques can be leveraged to discriminate between models with similar detection signatures.