Model independent features of the two-particle correlation function

Coalescence and flow in ultrarelativistic heavy ion collisions

“…The variation of the local equilibrium distribution functions f is due to the hydrodynamic expansion of the fireball. A is sensitive to flow gradients in very much the same way as the correlation function in two-particle interferometry [3]. In the absence of flow gradients A = 1 for sufficiently large fireball volumes; for smaller volumes one recovers the model proposed by Hagedorn for pp collisions who suggested A = Ω |ϕ d | 2 dV as the probability deuteron production in a small reaction volume Ω [4].…”

Hanbury-Brown–Twiss interferometry relative to the triangular flow plane in heavy-ion collisions

“…Assuming a "chaotic source" that emits the two particles independently (i.e. without dynamical correlations) and ignoring final state interactions between the two particles after their last scattering with the source medium, the two-particle phase-space distribution for the emitted particles factorizes, and for a pair of identical bosons this correlation function can be written as [1,2,21]…”

“…For Gaussian sources whose spatial emission region, for each value K of the pair momentum, can be completely characterized by its spatial variances, the correlator C(q, K) has a Gaussian q-dependence [21]:…”

“…In this spirit, we generalize the well-studied hydrodynamically expanding Gaussian source model used in Refs. [6,9,10,21,25]) as follows:…”

Resolving the space-time structure of sonoluminescence by intensity interferometry

“…This approximation makes the following discussion more transparent, but can be systematically corrected for [16] (see below). The factor 1 2 in front of the second term in the correlator (3) takes into account [17] that only photons with equal helicity states are affected by Bose symmetrization.…”