Abstract
ATLAS has studied different aspects of QCD in pp and PbPb collisions. A summary of interesting recent results at centre-of-mass energies of 7 TeV, 8 TeV and 13 TeV (pp), and 2.76 TeV (PbPb) per nucleon pair is presented. Using pp collisions, measurements of Z, W, photon, quarkonia and open charm production differential cross sections in a variety of variables are presented. Jet and heavy flavour muon measurements in PbPb collisions, aimed to test the properties of the Quark Gluon Plasma, with the view of better understanding of jet quenching, are also presented.
Highlights
The Large Hadron Collider (LHC) is the energy frontier of high energy particle physics, providing the highest energy and highest luminosity environment for proton-proton and heavy ion (HI) collisions to date
Signals arising from collisions of coloured constituents of the matter are dominated by Quantum Chromodynamic (QCD) processes
The measurement of the inclusive Z boson pT spectrum at 8 TeV provides a comprehensive test of QCD predictions spanning the non-perturbative regime at low pT to the perturbative regime at high pT [3]
Summary
The Large Hadron Collider (LHC) is the energy frontier of high energy particle physics, providing the highest energy and highest luminosity environment for proton-proton (pp) and heavy ion (HI) collisions to date. ATLAS is a multipurpose particle detector with a broad physics program that makes use of precision tracking, calorimetry and muon detectors [1]. Signals arising from collisions of coloured constituents of the matter are dominated by Quantum Chromodynamic (QCD) processes. Measuring broad aspects of QCD production provides constraints on QCD theoretical predictions as well as requisites for the empirical description of the proton and its constituents. Having an accurate description of the QCD background of non-QCD measurements, such as Higgs measurements or searches beyond the Standard Model, is critical to their success
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