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      Multiplicity and transverse-momentum dependence of two- and four-particle correlations in pPb and PbPb collisions

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          Abstract

          Measurements of two- and four-particle angular correlations for charged particles emitted in pPb collisions are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 31 inverse nanobarns, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. The results are compared to 2.76 TeV semi-peripheral PbPb collision data, collected during the 2011 PbPb run, covering a similar range of particle multiplicities. The observed correlations are characterized by the near-side (abs(Delta(phi)~0) associated pair yields and the azimuthal anisotropy Fourier harmonics (v[n]). The second-order (v[2]) and third-order (v[3]) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. A four-particle correlation method is also applied to obtain the value of v[2] and further explore the multi-particle nature of the correlations. Both associated pair yields and anisotropy harmonics are studied as a function of particle multiplicity and transverse momentum. The associated pair yields, the four-particle v[2], and the v[3] become apparent at about the same multiplicity. A remarkable similarity in the v[3] signal as a function of multiplicity is observed between the pPb and PbPb systems. Predictions based on the color glass condensate and hydrodynamic models are compared to the experimental results.

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            Anisotropy as a signature of transverse collective flow

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              Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics

              We present results for the elliptic and triangular flow coefficients in Au+Au collisions at root-s=200 AGeV using event-by-event (3+1)D viscous hydrodynamic simulations. We study the effect of initial state fluctuations and finite viscosities on the flow coefficients v_2 and v_3 as functions of transverse momentum and pseudo-rapidity. Fluctuations are essential to reproduce the measured centrality dependence of elliptic flow. We argue that simultaneous measurements of v_2 and v_3 can determine eta/s more precisely.
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                Author and article information

                Journal
                02 May 2013
                2013-07-12
                Article
                10.1016/j.physletb.2013.06.028
                1305.0609

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

                Custom metadata
                CMS-HIN-13-002, CERN-PH-EP-2013-077
                Phys. Lett. B 724 (2013) 213
                Replaced with published version. Added journal reference and DOI
                nucl-ex hep-ex

                High energy & Particle physics, Nuclear physics

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