• ATLAS
• jet
• LHC
• parton density functions
• qcd

The measurement of the inclusive jet cross section is one of the test of perturbative quantum chromo-dynamics par excellence. The inclusive jet cross section presented in this thesis is measured with the ATLAS detector at the Large Hadron Collider (LHC). The double-differential inclusive jet cross section has been measured in bin of transverse momentum pT and rapidity |y|. It measures the cross sections for anti-kt jet with resolution parameter R = 0.4 and R = 0.6 for 20 GeV < pT < 1500 GeV, and for −4.4 < y < 4.4, which is the wider range reached so far at hadron collider. The total recorded integrated luminosity L in 2010, used in this analysis, is almost 37 pb−1. Four distinctive features make this measurement one of the more extensive and detailed tests of the jet physics at hadron colliders:
(a) the measurement can profit of the unprecedented collision intensity and center-of-mass energy of sqrt(s) = 7 TeV provided by the Large Hadron Collider, overcoming the highest measured jet energies in previous experiments;
(b) the wide solid angle coverage of the ATLAS experiment allow the measurement of the cross section in uncharted angular regions;
(c) the quality of the ATLAS measurement of jets at low energies allow the extension of the cross section measurement to really low energy;
(d) the jet cross section profits of the new anti-kt jet definition developed in the last couple
of years, which overcames most of the problems of the previous definitions.