Abstract
An overview of the ATLAS results from Pb+Pb collisions at √sNN = 2.76 TeV will be presented. The results for hard probes include both single jet and di-jet measurements, W and Z bosons, photons, and high pT charged tracks. Taken together these results provide a compelling picture of the interaction of hard particles in the dense QCD medium. Additionally, ATLAS has measured properties of the bulk particle production including charged particle multiplicity and extensive measurements of the azimuthal particle distributions and correlations. Results shown will be from the ∼ 10 inverse µb−1 of minimum bias recorded in the 2010 LHC heavy ion run, as well as from ∼ 0.15 nb−1 sampled in the 2011 LHC heavy ion run.
Highlights
Lead-Lead collisions at √ sNN = TeV in the Large Hadron Collider (LHC)provide the opportunity to study strongly interacting matter at the highest temperatures achieved in the laboratory
Pb+Pb include collisions both single at jet and di-jet measurements, W and Z bosons, photons, and high pT charged tracks. Taken together these results provide a compelling picture of the interaction of hard particles in the dense QCD medium
As seen in the figure, the particle production of photons and Z bosons scales with Ncoll confirming that within the experimental precision electroweak bosons are not effected by the medium, and that the binary collision model is correct for non-color charge carrying particles
Summary
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. These measurements include bulk properties of the system - charged particle multiplicity [1] and extensive measurements of the azimuthal particle distributions and correlations [2] - as well as hard probes such as photons [3], W [4] and Z bosons[5], high pT charged tracks [6], single [7] and di-jet measurements [8], and muons from heavy flavor decays [9].
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