1345343 20150123111619.0 oai:cds.cern.ch:1345343 cerncds:FULLTEXT Inspire 1196773 ATL-PHYS-PUB-2011-008 eng ATL-COM-PHYS-2011-329 The ATLAS collaboration New ATLAS event generator tunes to 2010 data 2011 CERN Geneva 18 Apr 2011 atlas-phys-gener-conveners@cern.ch Monte Carlo conveners, ATLAS 33 p This note describes the Monte Carlo event generator tunings for the Pythia 6 and Herwig/Jimmy generators in the ATLAS MC11 simulation production. New tunes have been produced for these generators, making maximal use of available published data from ATLAS and from the Tevatron and LEP experiments. Particular emphasis has been placed on improvement of the description of e+ e− event shape and jet rate data, and on description of hadron collider event shape observables in Pythia, as well as the established procedure of tuning the multiple parton interactions of both models to describe underlying event and minimum bias data. The tuning of Pythia is provided at this time for the MRST LO∗∗ PDF, while the purely MPI tune of Herwig/Jimmy is performed for ten different PDFs. PUB CERN CDS-Invenio WebSubmit Detectors and Experimental Techniques SzGeCERN Physics SzGeCERN CERN Monte Carlo CERN Tuning CERN QCD CERN Underlying event CERN Minimum bias CERN Event shapes CERN Jet rates CERN Jet shapes CERN PYTHIA CERN HERWIG CERN JIMMY CERN QCD CERN MCGENERATORS CERN INTNOTE PUBLATLAS INTNOTEATLASPUBL CERN LHC ATLAS PH-EP http://cds.cern.ch/record/1340273 Original Communication (restricted to ATLAS) http://cds.cern.ch/record/1345343/files/ATL-PHYS-PUB-2011-008.pdf Could not be stamped by WebSubmit: 18/04/2011 andy.buckley@ed.ac.uk judith.katzy@cern.ch holger.schulz@physik.hu-berlin.de c.gwenlan1@Physics.ox.ac.uk loch@physics.arizona.edu n 201170 91 PUBLIC 000713944CER INTNOTEATLASPUBL NOTE