Abstract
Two-particle correlation projections onto two-dimensional transverse momentum coordinates (pt1,pt2) allow access to properties of the relativistic heavy-ion collision system which are complementary to that studied using angular correlations. Examples include the degree of thermal equilibration and the variance of dynamical fluctuations in hard-scattering processes. Results for minimum-bias Au + Au collisions at √sNN= 200 are presented, with the structures described by two phenomenological models. The correlations structures and extracted physical quantities are then compared to theoretical predictions. Conclusions from these comparisons regarding global equilibration, fluctuations in soft and semi-hard QCD processes, and the effects of the hot, dense collision medium are presented.
Highlights
Two-particle correlation measurements in high-energy, heavy-ion collisions provide access to partonic and hadronic dynamics occurring throughout the spatio-temporal evolution of the hot, dense matter produced in the collisions
Much less attention has been given to correlation distributions on transverse momentum. The latter type of measurements have been reported by the NA49 [1, 2], CERES [3], and STAR [4,5,6] Collaborations
The fit parameters are shown in the lower row of panels in figure 2 where ∆(1/q)Vol and ∆(1/q)cov are defined in the same way as the corresponding two-component fragmentation (TCF) parameters, and ∆ηt controls the covariance of the two-particle transverse flow rapidity
Summary
Two-particle correlation measurements in high-energy, heavy-ion collisions provide access to partonic and hadronic dynamics occurring throughout the spatio-temporal evolution of the hot, dense matter produced in the collisions. [7] it was shown how to relate two-particle correlation distributions on transverse momentum coordinates to several of the mean-pt fluctuation quantities in the literature. N − 1 n jk n j l , Nmix j j where all charged particle pairs are included, is the number of collision events in the centrality or multiplicity bin, and index j denotes a specific event.
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