Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at [sqrt] s=7 TeV
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 recons...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Other Authors: | , , |
Format: | Article |
Language: | English |
Published: |
American Physical Society,
2011-02-04T23:02:08Z.
|
Subjects: | |
Online Access: | Get fulltext |
Summary: | 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.) |
---|