A twisted emission geometry in non-central Pb+Pb collisions measurable via azimuthally sensitive HBT

Abstract

We use the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model to simulate Pb+Pb collisions. In the freeze out geometry of non-central Pb+Pb collisions we observe a tilt of the particle emission zone in the collision plane away from the beam axis. We find that the magnitude of this tilt depends on the scale at which the distribution is measured. We quantify this "twisting" behavior with a parameterization and propose to measure it experimentally via azimuthally sensitive Hanbury-Brown Twiss correlations. Additionally we show that the twist is related to the emission of particles from different times during the evolution of the source. A systematic comparison between the theoretically observed twist in the freeze out position distribution and a mock experimental analysis of the model calculations via HBT correlations is shown.

10 pages, 7 figures

References in corpus (6)

• The effect of "pre-formed" hadron potentials on the dynamics of heavy ion collisions and the HBT puzzle
• Effects of a phase transition on HBT correlations in an integrated Boltzmann+Hydrodynamics approach
• UrQMD calculations of two-pion HBT correlations in central Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV
• Shape analysis of strongly-interacting systems: the heavy ion case
• Azimuthal dependence of pion source radii in Pb+Au collisions at 158 A GeV
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Cited by in corpus (5)

• Femto-cyclones and hyperon polarization in Heavy-Ion Collisions
• Lambda Polarization in an Exact Rotating and Expanding fluid dynamical model for peripheral heavy ion reactions
• Differential HBT Applied to Relativistic Fluid Dynamics
• Azimuthally sensitive femtoscopy in event-by-event hydrodynamics
• Interferometry for rotating sources