Abstract
Measurements of azimuthal angular correlations are presented for high-multiplicity pPb collisions at $\sqrt{s_\mathrm{NN}}=$ 5.02 TeV and peripheral PbPb collisions at $\sqrt{s_\mathrm{NN}}=$ 2.76 TeV. The data used in this work were collected with the CMS detector at the CERN LHC. Fourier coefficients as functions of transverse momentum and pseudorapidity are studied using the scalar product method, 4-, 6-, and 8-particle cumulants, and the Lee-Yang zeros technique. The influence of event plane decorrelation is evaluated using the scalar product method and found to account for most of the observed pseudorapidity dependence.
Highlights
High energy density matter with quark and gluon degrees of freedom, a state of matter known as the quark-gluon plasma (QGP), is created in relativistic heavy ion collisions at the Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider (RHIC) and at the CERN Large Hadron Collider (LHC) [1,2,3,4,5,6]
In collisions between two heavy nuclei, such as CuCu and AuAu collisions at RHIC [12,13,14] and PbPb collisions at the LHC [16,17,18,19], these long-range correlations are often attributed to the collective flow from a strongly interacting, expanding medium [20,21]
2.76 TeV based on scalar product, pPb colmultiparticle cumulant, and Lee-Yang zero analyses
Summary
High energy density matter with quark and gluon degrees of freedom, a state of matter known as the quark-gluon plasma (QGP), is created in relativistic heavy ion collisions at the Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider (RHIC) and at the CERN LHC [1,2,3,4,5,6]. 200 GeV find significant elliptic flow coefficients [44] In combination, these measurements support a collective origin of the azimuthal correlations, and have raised the possibility that a QGP droplet might be formed in small-system collisions exhibiting fluidlike behavior [28,29,30,39,45]. The centrality variable is defined as a fraction of the inelastic hadronic cross section in heavy ion collisions, with 0% corresponding to the most central, i.e., head-on collisions This allows for a direct comparison of pPb and PbPb systems over a broad range of similar particle multiplicities, thereby helping to clarify the underlying mechanism responsible for the observed correlations
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