Measurement of the double-differential inclusive jet cross section in proton-proton collisions at sqrt(s) = 13 TeV

TL;DR

This paper reports a detailed measurement of inclusive jet cross sections at 13 TeV proton-proton collisions, comparing results with advanced QCD predictions and Monte Carlo simulations to test the understanding of jet physics at high energies.

Contribution

First measurement of double-differential inclusive jet cross sections at 13 TeV with detailed comparisons to theoretical models and simulations.

Findings

Jet cross sections are well described by NLO QCD with corrections.

Smaller jet size R=0.4 predictions match Monte Carlo simulations.

Jet physics at 13 TeV is as well understood as at lower energies.

Abstract

A measurement of the double-differential inclusive jet cross section as a function of jet transverse momentum pT and absolute jet rapidity |y| is presented. The analysis is based on proton-proton collisions collected by the CMS experiment at the LHC at a centre-of-mass energy of 13 TeV. The data samples correspond to integrated luminosities of 71 and 44 inverse picobarns for |y| < 3 and 3.2 < |y| < 4.7, respectively. Jets are reconstructed with the anti-kt clustering algorithm for two jet sizes, R, of 0.7 and 0.4, in a phase space region covering jet pT up to 2 TeV and jet rapidity up to |y| = 4.7. Predictions of perturbative quantum chromodynamics at next-to-leading order precision, complemented with electroweak and nonperturbative corrections, are used to compute the absolute scale and the shape of the inclusive jet cross section. The cross section difference in R, when going to a smaller jet size of 0.4, is best described by Monte Carlo event generators with next-to-leading order predictions matched to parton showering, hadronisation, and multiparton interactions. In the phase space accessible with the new data, this measurement provides a first indication that jet physics is as well understood at sqrt(s) = 13 TeV as at smaller centre-of-mass energies.