Abstract
Measurements of high-pT processes in lead-lead collisions can provide insight into the physics responsible for the quenching of jets in the quark gluon plasma. Results are presented from ATLAS measurements of single jet suppression, both inclusively and as a function of the azimuthal angle of the jets with respect to the elliptic flow plane, single jet fragmentation, and gamma-jet correlations. Implications of the results are discussed. Results are also presented for measurements of photon and Z boson production that provide essential tests on calculations of hard scattering rates using binary collision scaling.
Highlights
√ Lead-lead collisions at sNN = 2.76 TeV in the Large Hadron Collider (LHC) provide the opportunity to study strongly interacting matter at the highest temperatures achieved in the laboratory
In the 2010 and 2011 LHC runs, yielding approximately 10 μb−1 and 0.15 nb−1, respectively, the ATLAS experiment has made a set of measurements that form an emerging picture of the hot dense matter created in a heavy ion collision
The ATLAS detector [9] at the LHC covers nearly the entire solid angle around the collision point. It consists of an inner tracking detector surrounded by a thin superconducting solenoid, electromagnetic and hadronic calorimeters, and a muon spectrometer incorporating three superconducting toroid magnet systems
Summary
These measurements include hard probes such as photons [1, 2], Z bosons[3, 4], and single and di-jet measurements [5, 6, 7, 8]. High momentum particles allow us to probe the properties of the dense medium created in heavy ion collisions, and how color sensitive objects interact with it. Measurements of inclusive single particle spectra as well as two particle correlations have suggested that jets are being “quenched” in the medium, and much effort has been made to understand the mechanisms of this quenching.
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