Disentangling soft and collinear effects in QCD parton showers

Abstract

We introduce a method for the separation of soft and collinear logarithms in QCD parton evolution at $\mathcal{O}({\alpha }_s^2)$ and at leading color. Using an implementation of the technique in the Dire parton shower, we analyze the numerical impact of genuine triple-collinear corrections from quark pair emission in $e^{+}{e}^{-}\to$ hadrons.

11 pages, 1 figure

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• Parton showering with higher-logarithmic accuracy for soft emissions
• Conformal Colliders Meet the LHC
• A new approach to QCD final-state evolution in processes with massive partons
• Non-Gaussianities in Collider Energy Flux
• A general algorithm to build real-radiation antenna functions for higher-order calculations
• Multi-Collinear Splitting Kernels for Track Function Evolution
• Systematic Quark/Gluon Identification with Ratios of Likelihoods
• Decomposition of Triple Collinear Splitting Functions
• Measurements of Lund subjet multiplicities in 13 TeV proton-proton collisions with the ATLAS detector