HBT interferometry relative to the triangular flow plane in heavy-ion collisions

Abstract

The PHENIX Collaboration has reported third-order harmonic oscillations of the source radius parameters when measuring the Hanbury Brown-Twiss correlation function for charged hadrons relative to the triangular flow angle. We explore possible origins of such third-order oscillations with a simple Gaussian source featuring both a triangular geometric deformation and triangular flow. Third-order oscillations of the HBT radii can arise from a purely geometric triangular deformation superimposed on an azimuthally symmetric radial flow, or from a radially symmetry spatial distribution which expands anisotropically with a triangular component in the flow velocity profile. In both cases the final particle momentum distribution features triangular flow. We show that the two alternatives can be distinguished experimentally through the phase of the azimuthal oscillations of the HBT radii relative to the triangular flow plane.

11 pages, incl. 9 figures, submitted to Physical Review C

References in corpus (4)

• Collective flow and viscosity in relativistic heavy-ion collisions
• Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions
• Shape analysis of strongly-interacting systems: the heavy ion case
• Detailed HBT measurements with respect to the event plane and collision energy in Au+Au collisions at PHENIX

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