Abstract
We perform numerical studies in the framework of QCD kinetic theory to investigate the energy and angular profiles of a high energy parton — as a proxy for a jet produced in heavy ion collisions — passing through a Quark-Gluon Plasma (QGP). We find that the fast parton loses energy to the plasma mainly via a radiative turbulent quark and gluon cascade that transports energy locally from the jet down to the temperature scale where dissipation takes place. In this first stage of the system time evolution, the angular structure of the turbulent cascade is found to be relatively collimated. However, when the lost energy reaches the plasma temperature it is rapidly transported to large angles w.r.t. the jet axis and thermalizes. We investigate the contribution of the soft jet constituents to the total jet energy. We show that for jet opening angles of about 0.3 rad or smaller, the effect is negligible. Conversely, larger opening angles become more and more sensitive to the thermal component of the jet and thus to medium response. Our result showcases the importance of the jet cone size in mitigating or enhancing the details of dissipation in jet quenching observables.
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Acknowledgments
S.S. and I.S. are supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the CRC-TR 211 ‘Strong-interaction matter under extreme conditions’ — project number 315477589 — TRR 211 and the German Bundesministerium für Bildung und Forschung (BMBF) through Grant No. 05P21PBCAA. I.S. is supported in part by the U.S. Department of Energy (DOE) under grant number DE-SC0013460 and in part by the National Science Foundation (NSF) under grant number OAC-2004571 within the framework of the JETSCAPE collaboration. The authors also gratefully acknowledge computing time provided by the Paderborn Center for Parallel Computing (PC2). This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Y. M.-T. is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract No. DE- SC0012704 an acknowledges support from the RHIC Physics Fellow Program of the RIKEN BNL Research Center.
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Mehtar-Tani, Y., Schlichting, S. & Soudi, I. Jet thermalization in QCD kinetic theory. J. High Energ. Phys. 2023, 91 (2023). https://doi.org/10.1007/JHEP05(2023)091
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DOI: https://doi.org/10.1007/JHEP05(2023)091