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We present a phenomenological study of the current status of the applicationof our approach of {\it exact} amplitude-based resummation in quantum fieldtheory to precision QCD calculations, by realistic MC event generator methods,as needed for precision LHC physics. We discuss recent results as they relateto the interplay of the attendant IR-Improved DGLAP-CS theory of one of us andthe precision of exact NLO matrix-element matched parton shower MC's in theHerwig6.5 environment as determined by comparison to recent LHC experimentalobservations on single heavy gauge boson production and decay. The level ofagreement between the new theory and the data continues to be a reason foroptimism. In the spirit of completeness, we discuss as well other approaches tothe same theoretical predictions that we make here from the standpoint ofphysical precision with an eye toward the (sub-)1% QCD \otimes EW totaltheoretical precision regime for LHC physics.

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