Azimuthal correlations of high transverse momentum jets at next-to-leading order in the parton branching method

Abstract

The azimuthal correlation, $\Delta {\varphi }_{12}$, 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 $\Delta {\varphi }_{12}$ is observed. In the back-to-back region of $\Delta {\varphi }_{12}\to \pi$, 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 ${\alpha }_s$, 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 $\Delta {\varphi }_{12}$ measurements are also compared with predictions using MCatNLO together PYTHIA8, illustrating the importance of details of the parton shower evolution.

15 pages, 8 Figures

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Cited by in corpus (7)

• Back-to-back azimuthal correlations in Z+jet events at high transverse momentum in the TMD parton branching method at next-to-leading order
• QCD resummation of dijet azimuthal decorrelations in pp and pA collisions
• Multi-jet Merging with TMD Parton Branching
• On the normalization of unintegrated parton densities
• Azimuthal decorrelation for photon induced dijet production in ultra-peripheral collisions of heavy ions
• Collinear and TMD distributions with dynamical soft-gluon resolution scale
• Coarse-grained binning in Drell-Yan transverse momentum spectra