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.
Funding
- National Science Foundation
- U.S. Department of Energy
- Alfred P. Sloan Foundation
- Alexander von Humboldt-Stiftung
- Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
- Türkiye Atom Enerjisi Kurumu
- CERN
- Thailand Center of Excellence in Physics
- Institute for the Promotion of Teaching Science and Technology
- Kanton Zürich
- European Commission
- National Research Foundation
- Council of Scientific and Industrial Research, India
- Deutsche Forschungsgemeinschaft
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- National Natural Science Foundation of China
- Research Promotion Foundation
- Ministerstvo Školství, Mládeže a Tělovýchovy
- Fonds National de la Recherche Luxembourg
- Fundacja na rzecz Nauki Polskiej
- Russian Foundation for Basic Research
- Eesti Teadusagentuur
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Academy of Finland
- Bundesministerium für Bildung und Forschung
- Chinese Academy of Sciences
- Austrian Science Fund
- Fonds De La Recherche Scientifique - FNRS
- Belgian Federal Science Policy Office
- Chulalongkorn University
- Eidgenössische Technische Hochschule Zürich
- Fonds Wetenschappelijk Onderzoek
- Agentschap voor Innovatie door Wetenschap en Technologie
- Ministry of Education and Science of the Russian Federation
- General Secretariat for Research and Technology
- Ministry of Business, Innovation and Employment
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Ministry of Science, ICT and Future Planning
- Joint Institute for Nuclear Research
- Magyar Tudományos Akadémia
- A.G. Leventis Foundation
- National Science and Technology Development Agency
- Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul
- Universiti Malaya
- Narodowym Centrum Nauki
- Hrvatska Zaklada za Znanost
- Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- National Academy of Sciences of Ukraine
- Centre National de la Recherche Scientifique
- Universidad Autónoma de San Luis Potosí
- School of Mathematics, Institute for Research in Fundamental Sciences
- Benemérita Universidad Autónoma de Puebla
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives
- Lietuvos Mokslų Akademija
- Pakistan Atomic Energy Commission
- Federal Agency of Atomic Energy of the Russian Federation
- Istituto Nazionale di Fisica Nucleare
- National Research Center "Kurchatov Institute"
- Bundesministerium für Bildung, Wissenschaft und Forschung
- Board of the Swiss Federal Institutes of Technology
- Qatar National Research Fund
- Science and Technology Facilities Council
- Fundação para a Ciência e a Tecnologia
- Russian Academy of Sciences
- Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
- Secretaría de Estado de Investigación, Desarrollo e Innovación
- European Regional Development Fund
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
- Institut National de Physique Nucléaire et de Physique des Particules
- Nemzeti Kutatási, Fejlesztési és Innovaciós Alap
- Spanish National Plan for Scientific and Technical Research and Innovation
- European Social Fund
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