New ATLAS Event Generator Tunes to 2010 pp Collision Data at 7 TeV Centre-of-Mass Energy

Tunes of the PYTHIA 6 and HERWIG/JIMMY MC event generators to 7 TeV ATLAS data are shown. The four-stage PYTHIA 6 tuning procedure for PYTHIA 6 is described, focusing on tuning of the ISR/Primordial Kt and MPI stages, which use ATLAS data as inputs. The resulting AMBT2 and AUET2 PYTHIA tunes, for simulation of minimum bias and underlying event data respectively, are discussed. The single stage tunings of the HERWIG/JIMMY MPI parameters (also using ATLAS 7 TeV data) for 10 different PDFs are also shown.