Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC

7 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
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 (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), 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 eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 inverse nb data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate transverse momentum of 1-3 GeV/c, 2.0< |Delta(eta)| <4.8 and Delta(phi) near 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or p p-bar collisions.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00520522
Contributor : Dominique Girod <>
Submitted on : Thursday, September 23, 2010 - 2:50:38 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:12 AM

Citation

D. Sillou, M. Besançon, M. Dejardin, D. Denegri, J. Descamps, et al.. Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC. Journal of High Energy Physics, Springer, 2010, 09, pp.091. ⟨10.1007/JHEP09(2010)091⟩. ⟨in2p3-00520522⟩

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