Measurement of multidifferential cross sections for dijet production in proton-proton collisions at s = 13 Te V.

Abstract

A measurement of the dijet production cross section is reported based on proton-proton collision data collected in 2016 at $\sqrt{s}=13\mathrm{Te}V$ by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of up to 36.3 ${\mathrm{fb}}^{-1}$ . Jets are reconstructed with the anti- $k_{\text{T}}$ 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 ${\left|y\right|}_{\max }$ of the two jets with the highest transverse momenta $p_{\text{T}}$ and their invariant mass $m_{1,2}$ , and triple-differentially (3D) as a function of the rapidity separation $y^{\ast }$ , the total boost $y_b$ , and either $m_{1,2}$ or the average $p_{\text{T}}$ 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 ${\alpha }_{\text{S}}\left(m_Z\right)=0.1179\pm 0.0019$ .