Phenomenological Study of the Interplay between IR-Improved DGLAP-CS Theory and the Precision of an NLO ME Matched Parton Shower MC

TL;DR

This paper investigates how IR-Improved DGLAP-CS theory enhances the accuracy of NLO matrix-element matched parton shower Monte Carlo simulations for LHC physics, showing promising agreement with experimental data.

Contribution

It introduces an exact amplitude-based resummation approach integrated with parton shower MCs, improving precision in QCD calculations for collider phenomenology.

Findings

Enhanced agreement with LHC data on heavy gauge boson production.

Demonstrated potential for sub-1% theoretical precision in QCD  EW predictions.

Validated IR-Improved DGLAP-CS theory within Herwig6.5 environment.

Abstract

We present a phenomenological study of the current status of the application of our approach of {\it exact} amplitude-based resummation in quantum field theory to precision QCD calculations, by realistic MC event generator methods, as needed for precision LHC physics. We discuss recent results as they relate to the interplay of the attendant IR-Improved DGLAP-CS theory of one of us and the precision of exact NLO matrix-element matched parton shower MC's in the Herwig6.5 environment as determined by comparison to recent LHC experimental observations on single heavy gauge boson production and decay. The level of agreement between the new theory and the data continues to be a reason for optimism. In the spirit of completeness, we discuss as well other approaches to the same theoretical predictions that we make here from the standpoint of physical precision with an eye toward the (sub-)1% QCD \otimes EW total theoretical precision regime for LHC physics.