Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
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 s...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer
2020
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/88004/1/88004_Extraction%20and%20validation%20of%20a%20new%20set%20of%20CMS.pdf http://irep.iium.edu.my/88004/2/88004_Extraction%20and%20validation%20of%20a%20new%20set%20of%20CMS%20SCOPUS.pdf http://irep.iium.edu.my/88004/3/88004_Extraction%20and%20validation%20of%20a%20new%20set%20of%20CMS%20WOS.pdf http://irep.iium.edu.my/88004/ https://link.springer.com/article/10.1140/epjc/s10052-019-7499-4 |
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| Summary: | 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. |
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