Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements

CMS Collaboration

doi:10.1140/epjc/s10052-019-7499-4

Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements

CMS Collaboration

Física

A. Alikhanian Yerevan Institute of Physics
Institut für Hochenergiephysik der OeAW
TU Wien
Belarusian State University
University of Antwerp
Vrije Universiteit Brussel
Université Libre de Bruxelles
University of Kansas
Ghent University
Université Paris-Saclay
Université catholique de Louvain
Centro Brasileiro de Pesquisas Fisicas
Universidade do Estado do Rio de Janeiro
Universidade Estadual de Campinas
Universidade Federal do Rio Grande do Sul
Universidade Estadual Paulista Júlio de Mesquita Filho
Universidade Federal do ABC
Bulgarian Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics Chinese Academy of Science
Quaid-I-Azam University
CERN
University of Chinese Academy of Sciences
University of California, Davis
Texas Tech University
Peking University
Tsinghua University
University of Virginia
Universidad de los Andes Colombia
University of Split
Faculty of Science, University of Split
Institute Rudjer Boskovic
Institute for Theoretical and Experimental Physics
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Escuela Politecnica Nacional
Egyptian Network of High Energy Physics
Helwan University
Fayoum University
British University
Ain Shams University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
Lappeenranta University of Technology
King Abdulaziz University
Institut Pluridisciplinaire Hubert Curien
Université de Haute-Alsace
IN2P3-CNRS
Universite Claude Bernard Lyon 1
Lomonosov Moscow State University
Georgian Technical University
Tbilisi State University
RWTH Aachen University
Saha Institute of Nuclear Physics
Deutsches Elektronen-Synchrotron (DESY)
University of Hamburg
Brandenburg University of Technology
Karlsruhe Institute of Technology
NCSR Demokritos
National and Kapodistrian University of Athens
National Technical University of Athens
University of Ioannina
University of Debrecen
Eötvös Loránd University
KFKI Research Institute for Particle and Nuclear Physics
Institute for Nuclear Research
Indian Institute of Science
National Institute of Science Education and Research
Indian Institute of Technology Bhubaneswar
Institute of Physics Bhubaneswar
Panjab University
Indian Institute of Science Education and Research Pune
University of Delhi
Shoolini University of Biotechnology and Management Sciences
Tata Institute of Fundamental Research, Mumbai
Northwestern University
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Fermi National Accelerator Laboratory
Visva-Bharati University
Institute for Research for Fundamental Sciences
Isfahan University of Technology
Islamic Azad University, Science and Research Branch
University College Dublin
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University of Trento
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Universidad Autónoma de San Luis Potosí
University of Auckland
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National Centre for Nuclear Research
University of Warsaw
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Laboratório de Instrumentação e Fisica Experimental de Partículas
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National Research Nuclear University ‘Moscow Engineering Physics Institute’ (MEPhI)
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
University of Florida
Moscow Institute of Physics and Technology
RAS - P.N. Lebedev Physics Institute
Rutherford Appleton Laboratory
University of Southampton
California Institute of Technology
Novosibirsk State University
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National Research Tomsk Polytechnic University
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Research output: Contribution to journal › Article › peer-review

388 Scopus citations

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 next-to-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 quark-antiquark 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.

Original language	English
Article number	4
Journal	European Physical Journal C
Volume	80
Issue number	1
DOIs	https://doi.org/10.1140/epjc/s10052-019-7499-4
State	Published - 1 Jan 2020

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10.1140/epjc/s10052-019-7499-4

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@article{0b7912cd62ef479caba9f104c0eeb1bc,

title = "Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements",

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 next-to-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 quark-antiquark 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.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\"o} and \{Escalante Del Valle\}, A. and M. Flechl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and J. Hrubec and M. Jeitler and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and J. Wittmann and Wulz, \{C. E.\} and M. Zarucki and V. Chekhovsky and V. Mossolov and \{Suarez Gonzalez\}, J. and \{De Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and J. Lauwers and M. Pieters and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Remortel\}, N. and \{Abu Zeid\}, S. and F. Blekman and J. D{\textquoteright}hondt and \{De Clercq\}, J. and K. Deroover and G. Flouris and D. Lontkovskyi and S. Lowette and \{Carrera Jarrin\}, E.",

note = "Publisher Copyright: {\textcopyright} 2019, CERN for the benefit of the CMS collaboration.",

year = "2020",

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doi = "10.1140/epjc/s10052-019-7499-4",

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T1 - Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lauwers, J.

AU - Pieters, M.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Remortel, N.

AU - Abu Zeid, S.

AU - Blekman, F.

AU - D’hondt, J.

AU - De Clercq, J.

AU - Deroover, K.

AU - Flouris, G.

AU - Lontkovskyi, D.

AU - Lowette, S.

AU - Carrera Jarrin, E.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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 next-to-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 quark-antiquark 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.

AB - 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 next-to-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 quark-antiquark 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.

UR - https://www.scopus.com/pages/publications/85077325936

U2 - 10.1140/epjc/s10052-019-7499-4

DO - 10.1140/epjc/s10052-019-7499-4

M3 - Artículo

AN - SCOPUS:85077325936

SN - 1434-6044

VL - 80

JO - European Physical Journal C

JF - European Physical Journal C

IS - 1

M1 - 4

ER -

Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements

Abstract

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