Hanbury-Brown/Twiss Interferometry for Relativistic Heavy-Ion Collisions: Theoretical Aspects

TL;DR

This paper reviews two-particle interferometry techniques, especially Hanbury-Brown/Twiss interferometry, to analyze the space-time structure and dynamics of sources in relativistic heavy-ion collisions, emphasizing model-independent measures and source expansion.

Contribution

It introduces model-independent expressions for HBT size parameters and a new correlation function parametrization to distinguish source dimensions and expansion velocities.

Findings

Derived model-independent HBT size parameters.

Proposed a new correlation function parametrization.

Discussed effects of resonance decays.

Abstract

I discuss two-particle intensity interferometry as a method to extract from measured 1- and 2-particle momentum spectra information on the space-time geometry and dynamics of the particle emitting source. Particular attention is given to the rapid expansion and short lifetime of the sources created in relativistic heavy-ion collisions. Model-independent expressions for the HBT size parameters in terms of the space-time variances of the source are derived, and a new parametrization of the correlation function is suggested which allows to separate the transverse, longitudinal and temporal extension of the source and to measure its transverse and longitudinal expansion velocity. The effects of resonance decays are also discussed.