Abstract
The v3 coefficient, obtained using the PbAu data from the CERES detector at the top SPS energy of √sNN = 17.3 GeV, is presented. The v2 is measured over a pT range up to 100 GeV/c in PbPb collisions collected with the CMS detector. The v2{2} of charged and strange particles emitted in pp collisions shows a mass ordering effect. The v2{4} and v2{6} are comparable to the v2{2}, and thus supports the collective nature of the long-range correlations in high-multiplicity pp collisions at 13 TeV. Principle Component Analysis (PCA) of two-particle harmonics (VnΔ) is studied in PbPb and high-multiplicity pPb collisions at the LHC. The factorization breaking of the VnΔ can be attributed to the effect of initial-state fluctuations. Using a PCA, the VnΔ are characterized through the leading and sub-leading modes. The leading modes are essentially equivalent to the vn{2}. The sub-leading modes represent the largest sources of factorization breaking.
Highlights
One of main features of Quark Gluon Plasma is its hydrodynamic behavior characterized by vn coefficients extracted using methods like two- and many-particle correlations [1], the scalar product (SP) [2, 3] and the Lee-Yang Zero (LYZ) [4, 5]
The long-range (|Δη| > 2) correlation known as the ridge is observed in PbPb collisions [7], and in high-multiplicity pPb collisions [8] and even in smallest system formed in high-multiplicity pp collisions [9, 10] giving a hint that the ridge could have a hydrodynamic origin. charged particles are studied in pPb collisions at
The ordering of the pp results obtained from different methods is similar to what was observed in pPb and PbPb collisions [11]: the relation v2{2} ≥ v2{4} ≈ v2{6} in all three colliding systems is an evidence of a collective behavior
Summary
One of main features of Quark Gluon Plasma is its hydrodynamic behavior characterized by vn coefficients extracted using methods like two- and many-particle correlations [1], the scalar product (SP) [2, 3] and the Lee-Yang Zero (LYZ) [4, 5]. The CMS collaboration measured v2 coefficient in PbPb collisions over a wide pT range up to 100 GeV/c [6]. This measurement at high-pT is complementary to the nuclear modification factor (RAA) measurements. The long-range (|Δη| > 2) correlation known as the ridge is observed in PbPb collisions [7], and in high-multiplicity pPb collisions [8] and even in smallest system formed in high-multiplicity pp collisions [9, 10] giving a hint that the ridge could have a hydrodynamic origin. In the context of hydrodynamic models, they are a direct consequence of the initial-state fluctuations
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