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

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          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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          Viscous Hydrodynamic Predictions for Nuclear Collisions at the LHC

          , (2010)
          Hydrodynamic simulations are used to make predictions for the integrated elliptic flow coefficient v_2 in sqrt(s)=5.5 TeV lead-lead and sqrt(s)=14 TeV proton-proton collisions at the LHC. We predict a 10% increase in v_2 from RHIC to Pb+Pb at LHC, and v_2 ~ 0 in p+p collisions unless eta/s < 0.08.
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            Inclusive study of high-energy multiparticle production and two-body correlations

            L. Foà (1975)
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              Eccentricity fluctuations make flow measurable in high multiplicity p-p collisions

              Elliptic flow is a hallmark of collectivity in hadronic collisions. Its measurement relies on analysis techniques which require high event multiplicity and could be applied so far to heavy ion collisions only. Here, we delineate the conditions under which elliptic flow becomes measurable in the samples of high-multiplicity (\(dN_{\rm ch}/dy \geq 50\)) p-p collisions, which will soon be collected at the LHC. We observe that fluctuations in the p-p interaction region can result in a sizable spatial eccentricity even for the most central p-p collisions. Under relatively mild assumptions on the nature of such fluctuations and on the eccentricity scaling of elliptic flow, we find that the resulting elliptic flow signal in high-multiplicity p-p collisions at the LHC becomes measurable with standard techniques.
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                Author and article information

                Journal
                21 September 2010
                Article
                10.1007/JHEP09(2010)091
                1009.4122
                04ab0abb-ca00-424b-bae7-a936919b3216

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                CMS-QCD-10-002, CERN-PH-EP/2010-031
                JHEP 1009:091,2010
                hep-ex

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