Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements

Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi,, F. and Asilar, E. and Md. Ali, Mohd. Adli and CMS, The CMS collaboration (2020) Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements. The European Physical Journal C, 80 (1). pp. 1-47. ISSN 1434-6044

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Abstract

New sets of CMS underlying-event parameters (“tunes”) are presented for the pythia8 event generator. These tunes use the NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or nextto-next-to-leading (NNLO) orders in perturbative quantum chromodynamics, and the strong coupling evolution at LO or NLO. Measurements of charged-particle multiplicity and transverse momentum densities at various hadron collision energies are fit simultaneously to determine the parameters of the tunes. Comparisons of the predictions of the new tunes are provided for observables sensitive to the event shapes at LEP, global underlying event, soft multiparton interactions, and double-parton scattering contributions. In addition, comparisons are made for observables measured in various specific processes, such as multijet, Drell–Yan, and top quarkantiquark pair production including jet substructure observables. The simulation of the underlying event provided by the new tunes is interfaced to a higher-order matrix-element calculation. For the first time, predictions from pythia8 obtained with tunes based on NLO or NNLO PDFs are shown to reliably describe minimum-bias and underlying-event data with a similar level of agreement to predictions from tunes using LO PDF sets.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Extraction, validation, CMS PYTHIA8 tunes, underlying-event measurements
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Faizah Shahbudin
Date Deposited:	22 Jan 2021 16:25
Last Modified:	22 Jan 2021 16:25
URI:	http://irep.iium.edu.my/id/eprint/88004

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