A measurement of the dijet production cross section is reported based on proton-proton collision data collected in 2016 at $\sqrt{ s}$ = 13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of up to 36.3 fb$^{ -1}$. Jets are reconstructed with the anti-$k_\mathrm{ T}$ algorithm for distance parameters of $R$ = 0.4 and 0.8. Cross sections are measured double-differentially (2D) as a function of the largest absolute rapidity $\lvert y_\text{ max}\rvert$ of the two jets with the highest transverse momenta $p_\mathrm{ T}$ and their invariant mass $m_{ 1,2}$, and triple-differentially (3D) as a function of the rapidity separation $y^*$, the total boost $y_\mathrm{ b}$, and either $m_{ 1,2}$ or the average $p_\mathrm{ T}$ of the two jets. The 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 measurements on the parton distribution functions and the strong coupling constant at the mass of the Z boson is investigated, yielding a value of $\alpha_\mathrm{ S}(m_\mathrm{ Z})$ = 0.1179 $\pm$ 0.0019.
Categories: hep-ex