Speaker
Description
Jet measurements have long established that as hard scattered partons traverse the quark gluon plasma (QGP) they lose energy resulting in modified jets in A+A collisions relative to p+p collisions with no QGP. Understanding how the jets, their constituents and substructure are modified is crucial to discriminating between energy loss models and extracting the in-medium transport properties. Equally important is quantifying the response of the medium to this lost energy and disentangling such effects from the modified parton showers. By triggering on a high momentum hadron and measuring the distribution of hadrons opposite it in azimuth, we can study the particles correlated with the opposing jet. Model comparisons to the PHENIX $\pi^{0}-$hadron correlations suggest that medium response plays an important role for describing the low momentum hadron distribution. PHENIX has final results for the ratio ($I_{AA}$) and difference ($\Delta_{AA}$) of Au+Au to p+p as a function of the azimuthal angle. In addition, PHENIX is extracting these observables using direct photons as a trigger. The unmodified direct photon provides access to the kinematics of the initial hard scattering and selects a population of opposing jets predominantly from quarks. These measurements utilizing the highest statistics PHENIX 200 GeV Au+Au data set are also complimentary to LHC Z boson-track correlation studies, by exploring lower momentum jets at RHIC and further constraining energy loss models.
| Category | Experiment |
|---|---|
| Collaboration | PHENIX |
