Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
Abstract
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity () and azimuthal angle (). Short-range correlations in , which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb -1 data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate p T of 1-3 GeV/c, 2.0 < || < 4.8 and 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or pp collisions.
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)
- Eesti Teaduste Akadeemia
- Türkiye Atom Enerjisi Kurumu
- CERN
- Kanton Zürich
- European Commission
- 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
- National Science Council
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Academy of Finland
- Bundesministerium für Bildung und Forschung
- Chinese Academy of Sciences
- Eidgenössische Technische Hochschule Zürich
- Consejo Nacional de Ciencia y Tecnología
- General Secretariat for Research and Technology
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Joint Institute for Nuclear Research
- Nemzeti Kutatási és Technológiai Hivatal
- Ministry of Education, Science and Technology
- A.G. Leventis Foundation
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- Centre National de la Recherche Scientifique
- Ministerio de Ciencia e Innovación
- Universidad Autónoma de San Luis Potosí
- School of Mathematics, Institute for Research in Fundamental Sciences
- Bundesministerium für Wissenschaft und Forschung
- Lietuvos Mokslų Akademija
- Pakistan Atomic Energy Commission
- Istituto Nazionale di Fisica Nucleare
- Board of the Swiss Federal Institutes of Technology
- Science and Technology Facilities Council
- Fundação para a Ciência e a Tecnologia
- Comisión de Investigaciones Científicas
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
- Institut National de Physique Nucléaire et de Physique des Particules
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