Abstract
The hot and dense matter created in high-energy nuclear collisions is believed to undergo a transition into a deconfined phase where partonic degrees of free dom determine the dynamics of the medium. High-p? partons, that are produced in the initial collisions betwee n nucleons of the incoming nuclei, lose energy as they propagate through the medium. This effect, called jetquenching, is observed in high- p? particle spectra, in azimuthal correlations with the react ion plane (elliptic flow) and jet-like two-particle correlatio ns. STAR consists of tracking detectors and electromagnetic calorimetry with large and azimuthally symmetric acceptance and is exceptionally well suited for single particle detection and correlation studies at high p?. In the last five years, it has collected a large dataset inclu ding Au+Au and Cu+Cu collisions at different energies and reference data from p+p and d+Au collisions. We present particle spectra and two-particle correlations at high-p?, and relate these measurements to the properties of the medium.
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