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Breaking of factorization of two-particle correlations in hydrodynamics · Around

2012

Breaking of factorization of two-particle correlations in hydrodynamics

Gardim, Fernando G., Grassi, Frederique, Luzum, Matthew et al.

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The system formed in ultrarelativistic heavy-ion collisions behaves as a nearly-perfect fluid.

This collective behavior is probed experimentally by two-particle azimuthal correlations, which are typically averaged over the properties of one particle in each pair.
In this Letter, we argue that much additional information is contained in the detailed structure of the correlation.
In particular, the correlation matrix exhibits an approximate factorization in transverse momentum, which is taken as a strong evidence for the hydrodynamic picture, while deviations from the factorized form are taken as a signal of intrinsic, "nonflow" correlations.

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