Dynamical energy loss formalism: from describing suppression patterns to implications for future experiments

Abstract

© 2018 We overview our recently developed DREENA-C and DREENA-B frameworks, where DREENA (Dynamical Radiative and Elastic ENergy loss Approach) is a computational implementation of the dynamical energy loss formalism; C stands for constant temperature and B for the medium evolution modeled by Bjorken expansion. At constant temperature our predictions overestimate ν2, in contrast to other models, but consistent with simple analytical estimates. With Bjorken expansion, we obtain good agreement with both RAA and ν2 measurements. We find that introducing medium evolution has a larger effect on ν2 predictions, but for precision predictions it has to be taken into account in RAA predictions as well. We also propose a new observable, which we call path length sensitive suppression ratio, for which we argue that the path length dependence can be assessed in a straightforward manner. We also argue that Pb + Pb vs. Xe + Xe collisions make a good system to assess the path length dependence. As an outlook, we expect that introduction of more complex medium evolution (beyond Bjorken expansion) in the dynamical energy loss formalism can provide a basis for a state of the art QGP tomography tool – e.g. to jointly constrain the medium properties from the point of both high-p⊥ and low-p⊥ data.