Abstract
The azimuthal correlation, Delta phi _{12}, of high transverse momentum jets in pp collisions at sqrt{s}=13 TeV is studied by applying PB-TMD distributions to NLO calculations via MCatNLO together with the PB-TMD parton shower. A very good description of the cross section as a function of Delta phi _{12} is observed. In the back-to-back region of {Delta phi _{12}}rightarrow pi , a very good agreement is observed with the PB-TMD Set 2 distributions while significant deviations are obtained with the PB-TMD Set 1 distributions. Set 1 uses the evolution scale while Set 2 uses transverse momentum as an argument in alpha _mathrm {s}, and the above observation therefore confirms the importance of an appropriate soft-gluon coupling in angular ordered parton evolution. The total uncertainties of the predictions are dominated by the scale uncertainties of the matrix element, while the uncertainties coming from the PB-TMDs and the corresponding PB-TMD shower are very small. The Delta phi _{12} measurements are also compared with predictions using MCatNLO together Pythia8, illustrating the importance of details of the parton shower evolution.
Highlights
The uncertainties of the predictions are dominated by the scale uncertainties of the matrix element calculations, while the Parton Branching (PB)-TMD and TMD shower uncertainties are very small, as they are directly coming from the uncertainties of the PBTMDs
We have investigated the azimuthal correlatio√n of high transverse momentum jets in pp collisions at s = 13 TeV by applying PB-TMD distributions to NLO calculations via MCatNLO
We use the same PB-TMDs and MCatNLO calculations as we have used for Z -production at LHC energies in Ref. [42]
Summary
The description of the cross section of high pT jets in protonproton (pp) collisions is one of the most important tests of predictions obtained in Quantum Chromodynamics (QCD), and much progress has been achieved in the description of inclusive jets [1,2,3,4,5,6,7,8,9,10,11,12] by applying next-to-leading (NLO) [13,14,15,16] and next-to-next-to-leading-order (NNLO) calculations [17,18,19,20]. The azimuthal angle φ12 between the two highest transverse momentum pT-jets is an inclusive measurement of additional jet radiation.
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