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DREENA-B framework: First predictions of R and v2 within dynamical energy loss formalism in evolving QCD medium

D. Zigic,I. Salom,J. Auvinen,Marko Djordjevic,M. Djordjevic

Published 2018 in Physics Letters B

ABSTRACT

Abstract Dynamical energy loss formalism allows generating state-of-the-art suppression predictions in finite size QCD medium, employing a sophisticated model of high- p ⊥ parton interactions with QGP. We here report a major step of introducing medium evolution in the formalism though 1 + 1 D Bjorken (“B”) expansion, while preserving all complex features of the original dynamical energy loss framework. We use this framework to provide joint R A A and v 2 predictions, for the first time within the dynamical energy loss formalism in evolving QCD medium. The predictions are generated for a wide range of high p ⊥ observables, i.e. for all types of probes (both light and heavy) and for all centrality regions in both P b + P b and X e + X e collisions at the LHC. Where experimental data are available, DREENA-B framework leads to a good joint agreement with v 2 and R A A data. Such agreement is encouraging, i.e. may lead us closer to resolving v 2 puzzle (difficulty of previous models to jointly explain R A A and v 2 data), though this still remains to be thoroughly tested by including state-of-the-art medium evolution within DREENA framework. While introducing medium evolution significantly changes v 2 predictions, R A A predictions remain robust and moreover in a good agreement with the experimental data; R A A observable is therefore suitable for calibrating parton-medium interaction model, independently from the medium evolution. Finally, for heavy flavor, we observe a strikingly similar signature of the dead-cone effect on both R A A and v 2 - we also provide a simple analytical understanding behind this result. Overall, the results presented here indicate that DREENA framework is a reliable tool for QGP tomography.

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