CERN Accelerating science

CMS Note
Report number	CMS-CR-2019-197
Title	Monte Carlo modeling and tuning studies at CMS
Author(s)	Covarelli, Roberto (INFN, Turin ; Turin U.)
Collaboration	CMS Collaboration
Publication	SISSA, 2020
Imprint	09 Oct 2019
Number of pages	6
In:	PoS EPS-HEP2019 (2020) 502
In:	European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.502
DOI	10.22323/1.364.0502
Subject category	Detectors and Experimental Techniques ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The Monte Carlo modeling adopted at the CMS experiment is reviewed. Choices of matrix-element generators are explained and new CMS PYTHIA8 underlying-event tunes are presented. The new tunes are obtained using minimum bias and underlying event observables exploiting Monte Carlo configurations with consistent parton distribution functions and strong coupling constant values in the matrix element and the parton shower, at leading order (LO), next-to-leading order (NLO) and next-to-next-to-leading order (NNLO). Validation and performance studies are presented by comparing the predictions of the new tunes to a wide range of different CMS measurements at 7, 8 and 13 TeV.
Copyright/License	© 2020-2024 The Authors (License: CC-BY-NC-ND-4.0)

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