Inclusive jet and dijet cross sections have been measured in proton-proton collisions at a center-of-mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider. The cross sections are measured using jets clustered with the anti-kt algorithm with parameters R = 0.4 and R = 0.6. These measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 pb–1. Inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. The measurements are performed in the jet rapidity range |y| < 4.4, covering jet transverse momenta from 20 GeV to 1.5 TeV and dijet invariant masses from 70 GeV to 5 TeV, the highest ever measured. The data are compared to expectations based on next-to-leading order QCD calculations corrected for non-perturbative effects, as well as to next-to-leading order Monte Carlo predictions. The measurements test QCD in a new kinematic regime, providing sensitivity to new exotic phenomena that may exist and helping to determine parton distribution functions in a region where they are currently not well-constrained.
|Commitee:||Nagel, Sidney, Shochet, Melvyn, Wagner, Carlos|
|School:||The University of Chicago|
|School Location:||United States -- Illinois|
|Source:||DAI-B 73/11(E), Dissertation Abstracts International|
|Subjects:||Quantum physics, Physics, Particle physics|
|Keywords:||Atlas, Dijet, Jet, Lhc, Qcd, Quark|
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