New Approach to Parton Shower MC's for Precision QCD Theory: HERWIRI1.0(31)

Understand

By implementing the new IR-improved Dokshitzer-Gribov-Lipatov-Altarelli-Parisi-Callan-Symanzik (DGLAP-CS) kernels recently developed by one of us in the HERWIG6.5 environment we generate a new MC, HERWIRI1.0(31), for hadron-hadron scattering at high energies.

• We use MC data to illustrate the comparison between the parton shower generated by the standard DGLAP-CS kernels and that generated by the new IR-improved DGLAP-CS kernels.
• The interface to MC@NLO, MC@NLO/HERWIRI, is illustrated.
• Comparisons with FNAL data and some discussion of possible implications for LHC phenomenology are also presented.