Dijet cross section in pp collisions at [formula omitted] with the CMS

Abstract

A measurement of the dijet production cross section is reported based on an integrated luminosity of 36.3 fb−1 of proton–proton collision data collected in 2016 at s=13 TeV by the CMS detector [2] at the CERN LHC. Jets are reconstructed with the anti-kT algorithm for distance parameters of R=0.4 and R=0.8 and differential cross sections are measured as a function of the kinematic properties of the two jets with largest transverse momenta pT. Double-differential (2D) measurements are presented as a function of the largest absolute rapidity |y|max of the two jets and the dijet invariant mass m1,2. Triple-differential (3D) measurements are presented as a function of the dijet rapidity separation y⁎, the total boost yb of the dijet system, and either m1,2 or the average dijet transverse momentum 〈pT〉1,2 as the third variable. The measured cross sections are unfolded to correct for detector effects and are compared with fixed-order calculations derived at next-to-next-to-leading order in perturbative quantum chromodynamics. The impact of the 2D and 3D measurements is investigated on the determination of the parton distribution functions (PDFs) and the strong coupling constant (αS), with the inclusion of the 3D cross sections yielding the more precise value of αS(mZ)=0.1201±0.0020.