Publications and Research
Document Type
Article
Publication Date
2015
Abstract
We show how angular asymmetries ∼ cos 2φ can arise in dipole scattering at high energies. We illustrate the effects due to anisotropic fluctuations of the saturation momentum of the target with a finite correlation length in the transverse impact parameter plane, i.e. from a domain-like structure. We compute the two-particle azimuthal cumulant in this model including both one-particle factorizable as well as genuine two-particle non-factorizable contributions to the two-particle cross section. We also compute the full BBGKY hierarchy for the four-particle azimuthal cumulant and find that only the fully factorizable contribution to c2{4} is negative while all contributions from genuine two, three and four-particle correlations are positive. Our results may provide some qualitative insight into the origin of azimuthal asymmetries in p + Pb collisions at the LHC which reveal a change of sign of c2{4} in high-multiplicity events.
Comments
This article was originally published in Physics Letters, Section B, available at https://doi.org/10.1016/j.physletb.2015.02.046
This work is distributed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).