2006/02/28 by Thorsten Renk · 3 citations
Physics and Astronomy · #Astrophysics #Energy (signal processing) #Hadron #Heavy ion #High-Energy Particle Collisions Research #Ion #Jet (fluid) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Star (game theory) #Thermodynamics #hep-ph
paper · pdf · doi:10.1103/physrevc.74.024903
published as Phys.Rev. C74 (2006) 024903 · 6 pages, 2 figures, expanded version with update of experimental data
arxiv created 2006/07/05 · openalex publication_date 2006/08/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The energy loss of high pT partons propagating through a hot and dense medium is regarded as a valuable tool to probe the medium created in ultrarelativistic heavy-ion collisions. The angular correlation pattern of hadrons associated with a hard trigger in the region of pT~1\text\ensuremath-2 GeV which exhibits a dip in the expected position of the away side jet has given rise to the idea that energy is lost predominantly to propagating collective modes (`Mach cones'). Recent measurements by the STAR Collaboration have shown that for a high pT>8 GeV trigger the angular pattern of associate hadrons for pT>4 GeV shows the emergence of the expected away side peak. These dijet events suggest that the away side parton may emerge occasionally without substantial energy loss. Since in such a back-to-back configuration one of the partons may travel through the central region of the fireball, the average in-medium pathlength is substantial and the expected energy loss is not only sensitive to the initial geometry of matter but also to the change of geometry due to expansion. We show that radiative energy loss is able to explain the dijet events provided that the expansion of the medium is taken into account.