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

D. Sillou 1 M. Besançon 2 M. Dejardin 2 D. Denegri 2 J. Descamps 2 B. Fabbro 2 J.L. Faure 2 F. Ferri 2 S. Ganjour 2 F.X. Gentit 2 A. Givernaud 2 P. Gras 2 G. Hamel de Monchenault 2 P. Jarry 2 E. Locci 2 J. Malcles 2 M. Marionneau 2 L. Millischer 2 J. Rander 2 A. Rosowsky 2 D. Rousseau 2 M. Titov 2 P. Verrecchia 2 S. Baffioni 3 L. Bianchini 3 M. Bluj 3 C. Broutin 3 Pierre Busson 3 C. Charlot 3 L. Dobrzynski 3 R. Granier de Cassagnac 3 M. Haguenauer 3 P. Miné 3 C. Mironov 3 C. Ochando 3 P. Paganini 3 D. Sabes 3 R. Salerno 3 Y. Sirois 3 C. Thiebaux 3 A. Zabi 3 J.-L. Agram 4 A. Besson 4 D. Bloch 4 D. Bodin 4 J.-M. Brom 4 M. Cardaci 4 E. Conte 4 F. Drouhin 4 C. Ferro 4 J.-C. Fontaine 4 D. Gelé 4 U. Goerlach 4 S. Greder 4 P. Juillot 4 M. Karim 4 A.-C. Le Bihan 4 Y. Mikami 4 P. van Hove 4 F. Fassi 5 D. Mercier 5 C. Baty 6 N. Beaupere 6 M. Bedjidian 6 O. Bondu 6 G. Boudoul 6 D. Boumediene 6 H. Brun 6 N. Chanon 6 R. Chierici 6 D. Contardo 6 P. Depasse 6 H. El Mamouni 7 A. Falkiewicz 6 J. Fay 6 S. Gascon 6 B. Ille 6 T. Kurca 6 T. Le Grand 6 M. Lethuillier 6 L. Mirabito 6 S. Perries 6 V. Sordini S. Tosi 6 Y. Tschudi 6 P. Verdier 6 H. Xiao 6
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.
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http://hal.in2p3.fr/in2p3-00520522
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Submitted on : Thursday, September 23, 2010 - 2:50:38 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:12 AM

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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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