Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC

2010/09/01 by CMS Collaboration, V. Khachatryan, A. M. Sirunyan +98 · 28 citations
Physics and Astronomy · #Atomic physics #Azimuth #Charged particle #Cluster (spacecraft) #Geometry #High-Energy Particle Collisions Research #Ion #Large Hadron Collider #Multiplicity (mathematics) #Nuclear physics #Optics #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Range (aeronautics) #hep-ex

paper · pdf · doi:10.1007/jhep09(2010)091

published as JHEP 1009:091,2010

openalex publication_date 2010/09/01 · arxiv created 2010/09/21 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

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.

Citations

• Elliptic flow in high multiplicity proton-proton collisions at √ s = 14 TeV as a signature of deconfinement and quantum energy density fluctuations
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