Abstract
The measurement of the triple-differential dijet production cross section as a function of the average transverse momentum p_{T,avg}, half the rapidity separation y^{*}, and the boost y_{b} of the two leading jets in the event enables a kinematical scan of the underlying parton momentum distributions. We compute for the first time the second-order perturbative QCD corrections to this triple-differential dijet cross section, at leading color in all partonic channels, thereby enabling precision studies with LHC dijet data. A detailed comparison with experimental CMS 8TeV data is performed, demonstrating how the shape of this differential cross section probes the parton densities in different kinematical ranges.
Highlights
The measurement of the triple-differential dijet production cross section as a function of the average transverse momentum pT;avg, half the rapidity separation yÃ, and the boost yb of the two leading jets in the event enables a kinematical scan of the underlying parton momentum distributions
It is directly sensitive to the dynamics of the pointlike strong-interaction partonic cross section and to the nonperturbative description of the internal proton structure encoded in the parton distribution functions (PDFs)
It is the combined interplay between the parton-parton scattering matrix elements and the parton luminosities that determines the shape of the dijet cross section
Summary
The measurement of the triple-differential dijet production cross section as a function of the average transverse momentum pT;avg, half the rapidity separation yÃ, and the boost yb of the two leading jets in the event enables a kinematical scan of the underlying parton momentum distributions. It is directly sensitive to the dynamics of the pointlike strong-interaction partonic cross section and to the nonperturbative description of the internal proton structure encoded in the parton distribution functions (PDFs) It is the combined interplay between the parton-parton scattering matrix elements and the parton luminosities that determines the shape of the dijet cross section. In this Letter, we calculate the triple-differential dijet cross section as a function of the following three kinematical variables: the average transverse momentum pT;avg 1⁄4 ðpT; þ pT;2Þ=2 of the two leading jets, half of their rapidity separation yà 1⁄4 jy1 − y2j=2, and the boost of the dijet system yb 1⁄4 jy þ y2j=2.
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