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

The European physical journal / C 82(1), 36 (2022). doi:10.1140/epjc/s10052-022-09997-1
The azimuthal correlation, $\Delta \phi$ , 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 $\Delta \phi$ is observed. In the back-to-back region of $\Delta \phi \to \pi$ 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 \alphas, and the above observation therefore confirms the importance of angular ordering in the 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.
Published by Springer, Heidelberg