Published September 1, 2013
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Journal Article
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Measurement of neutral strange particle production in the underlying event in proton-proton collisions at √s=7 TeV
Abstract
Measurements are presented of the production of primary K^(0)_(S) and Λ particles in proton-proton collisions at √s=7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K^(0)_(S) and Λ particles measured at pseudorapidities |η|<2 rise with increasing charged-particle jet pT in the range 1–10 GeV/c and saturate in the region 10–50 GeV/c. The rise and saturation of the strange-particle yields and transverse momentum sums in the underlying event are similar to those observed for inclusive charged particles, which confirms the impact-parameter picture of multiple parton interactions. The results are compared to recent tunes of the pythia Monte Carlo event generator. The pythia simulations underestimate the data by 15%–30% for K^(0)_(S) mesons and by about 50% for Λ baryons, a deficit similar to that observed for the inclusive strange-particle production in non-single-diffractive proton-proton collisions. The constant strange- to charged-particle activity ratios with respect to the leading jet p_T and similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.
Additional Information
© 2013 Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 26 May 2013; published 3 September 2013. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science and Research and the Austrian Science Fund; the Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education, Youth and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport; the Research Promotion Foundation, Cyprus; the Ministry of Education and Research, Recurrent financing Contract No. SF0690030s09 and European Regional Development Fund, Estonia; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucle´aire et de Physique des Particules/CNRS, and Commissariat a` l'E´ nergie Atomique et aux E ´ nergies Alternatives/CEA, France; the Bundesministerium fu¨ r Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation, and National Office for Research and Technology, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Korean Ministry of Education, Science and Technology and the World Class University program of NRF, Republic of Korea; the Lithuanian Academy of Sciences; the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Ministry of Science and Innovation, New Zealand; the Pakistan Atomic Energy Commission; the Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundac¸a˜o para a Cieˆncia e a Tecnologia, Portugal; JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and the Russian Foundation for Basic Research; the Ministry of Science and Technological Development of Serbia; the Secretarı´a de Estado de Investigacio´n, Desarrollo e Innovacio´n and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the National Science Council, Taipei; the Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science and Technology Facilities Council, UK; and the US Department of Energy and National Science Foundation. Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a` la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie doorWetenschap enTechnologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of Czech Republic; the Council of Science and Industrial Research, India; the Compagnia di San Paolo (Torino); the HOMING PLUS programme of Foundation for Polish Science, cofinanced by EU, Regional Development Fund; and the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF.Attached Files
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Additional details
Identifiers
- Eprint ID
- 41901
- Resolver ID
- CaltechAUTHORS:20131011-133244534
Funding
- Austrian Federal Ministry of Science and Research
- Austrian Science Fund
- Belgian Fonds de la Recherche Scientifique
- Fonds voor Wetenschappelijk Onderzoek
- CNPq (Brazil)
- CAPES (Brazil)
- FAPERJ (Brazil)
- FAPESP (Brazil)
- Bulgarian Ministry of Education, Youth, and Science
- CERN
- Chinese Academy of Sciences
- Ministry of Science and Technology
- National Natural Science Foundation of China
- COLCIENCIAS (Colombia)
- Croatian Ministry of Science, Education and Sport
- Research Promotion Foundation, Cyprus
- Ministry of Education and Research
- European Regional Development Fund, Estonia
- Academy of Finland
- Finnish Ministry of Education and Culture
- Helsinki Institute of Physics
- Institut National de Physique Nucléaire et de Physique des Particules/CNRS
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA) France
- Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz-Gemeinschaft Deutscher Forschungszentren
- General Secretariat for Research and Technology, Greece;
- National Scientific Research Foundation
- National Office for Research and Technology, Hungary
- Department of Atomic Energy, India
- Department of Science and Technology, India
- Institute for Studies in Theoretical Physics and Mathematics, Iran
- Science Foundation, Ireland
- Istituto Nazionale di Fisica Nucleare, Italy
- Korean Ministry of Education, Science and Technology
- World Class University program of NRF, Republic of Korea
- Lithuanian Academy of Sciences
- CINVESTAV (Mexico)
- CONACyT (Mexico)
- SEP (Mexico)
- UASLP-FAI (Mexico)
- Ministry of Science and Innovation, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education Poland
- National Science Centre, Poland
- Fundação para a Ciência e a Tecnologia (Portugal)
- JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan)
- Ministry of Education and Science of the Russian Federation
- Federal Agency of Atomic Energy of the Russian Federation,
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Ministry of Science and Technological Development of Serbia
- Secretaría de Estado de Investigaciόn, Desarrollo e Innovaciόn and Programa Consolider-Ingenio 2010, Spain
- Programa Consolider-Ingenio 2010
- Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER)
- National Science Council, Taipei
- Thailand Center of Excellence in Physics
- Institute for the Promotion of Teaching Science and Technology of Thailand
- National Science and Technology Development Agency of Thailand
- Scientific and Technical Research Council of Turkey
- Turkish Atomic Energy Authority
- STFC (United Kingdom)
- Department of Energy (DOE)
- NSF
- Marie-Curie programme
- European Research Council
- EPLANET (European Union)
- Leventis Foundation
- Alfred P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation à la Recherche dans l'índustrie et dans l'Ágriculture (FRIA-Belgium)
- Agentschap voor Innovatie doorWetenschap enTechnologie (IWT-Belgium)
- Ministry of Education, Youth and Sports (MEYS) of Czech Republic
- Council of Science and Industrial Research, India
- Compagnia di San Paolo (Torino)
- HOMING PLUS programme of Foundation for Polish Science
- EU-ESF
Dates
- Created
-
2013-10-15Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field