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  • Observation of long-range, ...
    Devroede, O.; Maes, M.; Dero, V.; Da Costa, E. M.; De Souza, S. Fonseca; Qian, S. J.; Raidal, M.; Haguenauer, M.; Sabes, D.; Anagnostou, G.; Wittmer, B.; Bender, W.; Thomas, M.; Jung, H.; Katkov, I.; Lange, W.; Wissing, C.; Draeger, J.; Heinrich, M.; Kyriakis, A.; Sikler, F.; Mehta, M. Z.; Nishu, N.; Sharma, R.; Calabria, C.; Fiore, L.; My, S.; Fabbri, F.; Piccolo, D.; Lista, L.; Santocchia, A.; Venturi, A.; Pandolfi, F.; Park, S.; Casimiro Linares, E.; Ahmed, I.; Almeida, N.; Bunin, P.; Finger, M.; Kossov, M.; Boos, E.; Gribushin, A.; Rusakov, S. V.; Djordjevic, M.; Alcaraz Maestre, J.; De La Cruz, B.; Puerta Pelayo, J.; Gonzalez Suarez, R.; Hegner, B.; Siegrist, P.; Pape, L.; Ivova Rikova, M.; Regenfus, C.; Chang, Y. W.; Güler, Y.; Vergili, M.; Akin, I. V.; Guler, A. M.; Sever, R.; Surat, U. E.; Smith, V. J.; Lyons, L.; Nash, J.; Hobson, P. R.; Khan, A.; Andrea, J.; Esen, S.; Chertok, M.; Tu, Y.; Lowette, S.; Mccoll, N.; Witherell, M.; Blekman, F.; Gibbons, L. K.; Cirino, G.; Bauerdick, L. A. T.; Vidal, R.; Gartner, J.; Lebolo, L. M.; Gleyzer, S. V.; Lae, C. K.; Yetkin, T.; Whitbeck, A.; Boutemeur, M.; Skuja, A.; Yoon, A. S.; Dahmes, B.; Mans, J.; Eads, M.; Lundstedt, C.; Hildreth, M.; Lynch, S.; Ruchti, R.; Miller, D. H.; Silvers, D.; Morales, J.; Lee, S. W.; Boutle, S.; Ledovskoy, A.; Grothe, M.

    The journal of high energy physics, 09/2010, Letnik: 2010, Številka: 9
    Journal Article

    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 ( η ) and azimuthal angle ( ϕ ). Short-range correlations in Δ η , 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 η (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 < |Δ η | < 4 . 8 and Δ ϕ ≈ 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or collisions.