Measurement of inclusive jet and dijet cross-sections in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV with the ATLAS detector

Abstract

Measurement of inclusive jet and dijet cross-sections in proton proton collisions at√ s = 13 TeV with the ATLAS detectorThe ATLAS Collaboration Inclusive jet and dijet cross-sections are measured in proton proton collisions at a centreof-mass energy of 13 TeV. The measurement uses a dataset with an integrated luminosity of 3.2 fb −1 recorded in 2015 with the ATLAS detector at the Large Hadron Collider. Jets are identified using the anti-k t algorithm with a radius parameter value of R = 0.4. The inclusive jet cross-sections are measured double-differentially as a function of the jet transverse momentum, covering the range from 100 GeV to 3.5 TeV, and the absolute jet rapidity up to |y| = 3. The double-differential dijet production cross-sections are presented as a function of the dijet mass, covering the range from 300 GeV to 9 TeV, and the half absolute rapidity separation between the two leading jets within |y| < 3, y * , up to y * = 3. Next-to-leading-order, and next-to-next-to-leading-order for the inclusive jet measurement, perturbative QCD calculations corrected for non-perturbative and electroweak effects are compared to the measured cross-sections.The ATLAS experiment [19,20] at the LHC is a multi-purpose particle detector with a forward-backward symmetric cylindrical geometry and a near 4π coverage in solid angle. 3 It consists of an inner tracking detector, electromagnetic and hadron calorimeters, and a muon spectrometer. The inner tracking detector covers the pseudorapidity range |η| < 2.5 and is used to reconstruct tracks and vertices. It consists of silicon pixel, silicon microstrip, and transition radiation tracking detectors, surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field. Lead/liquid-argon (LAr) sampling calorimeters provide electromagnetic (EM) energy measurements with high granularity. They consist of a barrel (|η| < 1.475) and two endcap (1.375 ≤ |η| < 3.2) regions. The hadron calorimeters are divided into five distinct regions: a barrel region (|η| < 0.8), two extended barrel regions (0.8 ≤ |η| < 1.7) and two endcap regions (1.5 ≤ |η| < 3.2). The barrel and extended barrel regions are instrumented with steel/scintillator tile calorimeters. The endcap regions are instrumented with LAr calorimeters for both the EM and hadronic energy measurements. The ATLAS calorimeters have very high lateral granularity and several samplings in depth over |η| < 3.2. The muon spectrometer surrounds the calorimeters and features three large air-core toroid superconducting magnets with eight coils each. The field integral of the toroids ranges between 2.0 and 6.0 Tm across most of the detector. It includes a system of precision tracking chambers for track measurement in the principal bending direction and fast detectors for triggering and measurement of the muon coordinate in the direction orthogonal to that determined by the precision-tracking chambers. A two-level trigger system is used to select events. The first-level trigger is implemented in hardware and uses a subset of t...

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