Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at [sqrt] s=7 TeV

• Main Authors: Paus, Christoph M. E. (Contributor), Zanetti, Marco (Contributor), Alver, Burak Han (Contributor), Bauer, Gerry P. (Contributor), Bendavid, Joshua L. (Contributor), Busza, Wit (Contributor), Butz, Erik M. (Contributor), Cali, Ivan Amos (Contributor), Chan, M. (Contributor), D'Enterria, David (Contributor), Everaerts, Pieter Bruno Bart (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Goncharov, Maxim (Contributor), Hahn, Kristian Allan (Contributor), Harris, P. (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Lee, Y. J. (Contributor), Li, Wei (Contributor), Loizides, Constantin (Contributor), Luckey, P. David, Jr (Contributor), Ma, Teng (Contributor), Nahn, Steven (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Rudolph, Matthew Scott (Contributor), Stephans, George S. F. (Contributor), Sumorok, Konstanty C. (Contributor), Sung, K. (Contributor), Wenger, Edward Allen (Contributor), Wyslouch, Boleslaw (Contributor), Xie, S (Author), Yilmaz, Yetkin (Contributor), Yoon, A. S. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Xie, S. (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2011-02-04T23:02:08Z.
• Subjects: Article
• Online Access: Get fulltext

Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at [sqrt]s=7  TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch/dη||η|<0.5=5.78±0.01(stat)±0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from [sqrt]s=0.9 to 7 TeV is [66.1±1.0(stat)±4.2(syst)]%. The mean transverse momentum is measured to be 0.545±0.005(stat)±0.015(syst)  GeV/c. The results are compared with similar measurements at lower energies.
European Organization for Nuclear Research
FMSR (Austria)
Fonds Wetenschappelijk Onderzoek - Vlaanderen
Fundação de Amparo à Pesquisa do Estado de São Paulo
Fonds de la Recherche Scientifique
Conselho Nacional de Pesquisas (Brazil)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bulgaria. Ministry of Emergency Situations (MES)
Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro
Fundação de Amparo à Pesquisa do Estado de São Paulo
Bulgaria. Ministry of Emergency Situations (MES)
European Organization for Nuclear Research
Chinese Academy of Sciences
China. Ministry of Science and Technology.
National Natural Science Foundation of China
Ministry of Science, Education and Sports of the Republic of Croatia
Research Promotion Foundation (Cyprus)
National Institute of Chemical Physics and Biophysics (Republic of Estonia)
Estonian Academy of Sciences
Academy of Finland
Helsinki Institute of Physics
Marine Electronics Finland
Commissariat à l'énergie atomique et aux énergies alternatives
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Bundesministerium für Bildung und Forschung, Germany
Deutsche Forschungsgemeinschaft
Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren
General Secretariat for Research and Technology (Greece)
Hungarian Scientific Research Foundation
National Office for Research and Technology (Hungary)
DAE of the Government of India
DST of the Government of India
Institute for Research in Fundamental Sciences (Iran)
Science Foundation Ireland
Istituto Nazionale di Fisica Nucleare of Italy
National Research Foundation of Korea
World Class University Program (Korea)
Lithuanian Academy of Sciences
Centro de Investigación y de Estudios Avanzados del I.P.N.
Consejo Nacional de Ciencia y Tecnología (Mexico)
Mexico. Ministry of Public Education
Universidad Autónoma de San Luis Potosí
Pakistan Atomic Energy Commission
Poland. State Committee for Scientific Research
Fundação para a Ciência e a Tecnologia
Joint Institute for Nuclear Research
Ministry of Education and Science of the Russian Federation
Serbia. Ministry of Science and Technological Development
Ministerio de Ciencia e Innovación, Spain
Programa Consolider-Ingenio 2010, Spain
Swiss Agency for Development and Cooperation
National Science Council of Taiwan
Türkiye Bilimsel ve Teknik Araştırma Kurumu
Türkiye Atom Enerjisi Kurumu
Science and Technology Facilities Council, United Kingdom
United States. Dept. of Energy
National Science Foundation (U.S.)