CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PUB-2011-008
Title	New ATLAS event generator tunes to 2010 data
Corporate Author(s)	The ATLAS collaboration
Imprint	18 Apr 2011. - 33 p.
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Monte Carlo ; Tuning ; QCD ; Underlying event ; Minimum bias ; Event shapes ; Jet rates ; Jet shapes ; PYTHIA ; HERWIG ; JIMMY ; QCD ; MCGENERATORS
Abstract	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.
Scientific contact person	Monte Carlo conveners, ATLAS (atlas-phys-gener-conveners@cern.ch)

Corresponding record in: Inspire