Constraining energy-loss model parameters using multiple high-pt observables at RHIC

High-momentum partons lose energy as they travel through the dense QGP that is formed at RHIC. In a recent publication PHENIX has performed a quantitative comparison between various parton energy-loss models and experimental data on single-particle suppression (R$_{AA})$ versus pt. These data provided a constraint on the model parameters of medium opacity. It is important to also compare these model calculations with other complementary observables, such as R$_{AA}$ as a function of the reaction plane, or the suppression of two-particle correlations. Using other observables can more fully test energy-loss models, since a broader suite of observables not only tests for consistency but may also offer better sensitivity to the model parameters and sample path-length distributions differently than R$_{AA}$. In this talk I will present the status of using PHENIX results to constrain the theoretical models of energy-loss at RHIC.