Abstract
Differential cross sections for the production of at least four jets have been measured in proton-proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider using the ATLAS detector. Events are selected if the four anti-$k_{t}$ R=0.4 jets with the largest transverse momentum ($p_{T}$) within the rapidity range $|y|<2.8$ are well separated ($dR^{\rm min}_{4j}>0.65$), all have $p_{T}>64$ GeV, and include at least one jet with $p_{T} >100$ GeV. The dataset corresponds to an integrated luminosity of 20.3 $fb^{-1}$. The cross sections, corrected for detector effects, are compared to leading-order and next-to-leading-order calculations as a function of the jet momenta, invariant masses, minimum and maximum opening angles and other kinematic variables.
Highlights
This analysis studies events where at least four jets are produced in a hard-scatter process
Events are selected if the four anti-kt R = 0.4 jets with the largest transverse momentum within the rapidity range |y| < 2.8 are well separated (∆R4mjin > 0.65), all have pT > 64 GeV, and include at least one jet with pT > 100 GeV
Events are selected if the four anti-kt R = 0.4 jets with the largest transverse momentum within the rapidity range |y| < 2.8 are well separated, all have pT > 64 GeV, and include at least one jet with pT > 100 GeV
Summary
The layout of the detector is based on four superconducting magnet systems, which comprise a thin solenoid surrounding the inner tracking detectors (ID) and a barrel and two end-cap toroids generating the magnetic field for a large muon spectrometer. The lead/liquid-argon (LAr) electromagnetic (EM) calorimeter is split into two regions: the barrel (|η| < 1.475) and the end-cap (1.375 < |η| < 3.2). A three-level trigger system [26] is used to select events for further analysis. The first level (L1) of the trigger reduces the event rate to less than 75 kHz using hardware-based trigger algorithms acting on a subset of detector information. The last two softwarebased trigger levels, referred to collectively as the High-Level Trigger (HLT), further reduce the event rate to about 400 Hz
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