Two-particle correlations in high energy collisions and the gluon four-point function

Details Two-particle correlations in high energy collisions and the gluon four-point function Two-particle correlations in high energy collisions and the gluon four-point function

2010-01-26

arxiv.org/abs/1001.4820v1

Phys.Rev.D81:094015,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

10.1103/PhysRevD.81.094015

We derive the rapidity evolution equation for the gluon four-point function in the dilute regime and at small x from the JIMWLK functional equation. We show that beyond leading order in Nc the mean field (Gaussian) approximation where the four point function is factorized into a product of two point functions is violated. We calculate these factorization breaking terms and show that they contribute at leading order in Nc to correlations of two produced gluons as a function of their relative rapidity and azimuthal angle, for generic (rather than back-to-back) angles. Such two-particle correlations have been studied experimentally at the BNL-RHIC collider and could be scrutinized also for pp (and, in the future, also AA) collisions at the CERN-LHC accelerator.

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