Leading and Sub-Leading Flows At the Lhc from the Cms
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The initial state fluctuations of the colliding heavy-ion nuclei play a major role in understanding the anisotropic flow of final state particles. Furthermore, an important signature of these fluctuations is the flow (event plane) angle dependence from p(T) that induces a measurable effect of factorization breaking in a pure relativistic hydrodynamic picture. Here, the effect of factorization breaking is described using a new method based on principal component analysis (PCA) and two-particle correlations. The method exposes leading and sub-leading mode, the leading corresponding to the standard elliptic and triangular flow and the sub-leading representing a new variable that is a direct response to initial state fluctuations. In this study, first measurements of the subflow are presented, as a function of transverse momentum in PbPb collisions at root s(NN) = 2.76 TeV and high-multiplicity pPb collisions at. root s(NN) = 5.02 TeV with CMS data.
Source:2016, 9, 3, 377-382
- Acta Physica Polonica B Proceedings Supplement, International Meeting on Excited QCD (eQCD 2016), Mar 06-12, 2016, Costa da Caparica, Portugal