Abstract
The inclusive jet cross-section is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using a data set corresponding to an integrated luminosity of 4.5 fb−1 collected with the ATLAS detector at the Large Hadron Collider in 2011. Jets are identified using the anti-k t algorithm with radius parameter values of 0.4 and 0.6. The double-differential cross-sections are presented as a function of the jet transverse momentum and the jet rapidity, covering jet transverse momenta from 100 GeV to 2 TeV. Next-to-leading-order QCD calculations corrected for non-perturbative effects and electroweak effects, as well as Monte Carlo simulations with next-to-leading-order matrix elements interfaced to parton showering, are compared to the measured cross-sections. A quantitative comparison of the measured cross-sections to the QCD calculations using several sets of parton distribution functions is performed.
Highlights
Centre-of-mass energies, s = 2.76 TeV [2, 3] and s = 7 TeV [4,5,6,7,8]
The inclusive jet cross-section is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using a data set corresponding to an integrated luminosity of 4.5 fb−1 collected with the ATLAS detector at the Large Hadron Collider in 2011
The measurement of the double-differential inclusive jet cross-section is presen√ted as a function of the transverse momentum of the jets, pT, and their rapidity,1 y, at s = 7 TeV using the data collected by the ATLAS experiment in 2011, corresponding to an integrated luminosity of 4.5 fb−1
Summary
Jets are identified using the anti-kt algorithm [10] in the four-momentum recombination scheme, implemented in the FastJet [11, 12] software package. Inputs to the jet algorithm can be partons in the NLO pQCD calculation, stable particles after the hadronisation process in the Monte Carlo simulations, or energy deposits in the detector. Throughout this paper, the jet cross-section refers to the cross-section of jets clustered from stable particles with a proper mean lifetime, τ , given by cτ > 10 mm. Muons and neutrinos from decaying hadrons are included in this definition. These jets are referred to as particle-level jets in this paper. Jets built using partons from NLO pQCD predictions are referred to as parton-level jets. The NLO pQCD predictions with the parton-level jets must be corrected for hadroni-. Sation and underlying-event effects in order to be compared to the particle-level measurements. The measurement is performed in a kinematic region with pT ≥ 100 GeV and |y| < 3
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