Two-proton correlations relative to the reaction plane

In this paper we present the preliminary results of the first study of the proton correlation function's dependence on the orientation of the reaction plane.Comment: Revtex, 9 pages, 5 figures, Talk presented at the 14th Winter Workshop on Nuclear Dynamics, Snowbird, 199

Probing Baryon Freeze-out Density at the AGS with Proton Correlations

First measurements of the beam energy dependence of the two proton correlation function in central Au+Au collisions are performed by the E895 Collaboration at the BNL AGS. The imaging technique of Brown-Danielewicz is used in order to extract information about the proton source at freeze-out. Measured correlation functions and sources do not exhibit significant changes with beam energy.Comment: talk given at the XXIX International Symposium on Multiparticle Dynamics (ISMD99), August 9-13, 1999, Brown University, Providence, RI 02912, U

Imaging proton sources and space-momentum correlations

The reliable extraction of information from two-proton correlation functions is a long-standing problem in two-particle interferometry. Recently introduced imaging techniques give one the ability to reconstruct source functions from the correlation data in a model independent way. We explore the applicability of two-proton imaging to realistic sources with transverse space-momentum correlations. We find that the proton images are very sensitive to these correlations. We show that one can reliably reconstruct the source functions from the two-proton correlation functions, regardless of the degree of the space-momentum correlations.Comment: 4 pages, 2 figures, RevTex, minor corrections. Improved discussion of constructing source in model and minor figure correction. To appear Phys. Rev.

Search for delays between unlike particle emissions in relativistic heavy-ion collisions

The possibilities of unlike particle correlations for a study of particle delays and spatial shifts in relativistic heavy ion collisions are demonstrated. This report represents the unpublished Ref. [4] in the paper by S. Voloshin et al., Phys. Rev. Lett. {\bf 79} (1977) 4766; the report abstract was submitted to the conference Quark Matter'97.Comment: 5 pages, RevTe

Proton and deuteron distributions as signatures for collective particle dynamics and event shape geometries at the RHIC

We present predictions for the formation of (anti)nuclear bound states in nucleus-nucleus reactions at RHIC energies. he phase space coalescence method is used in combination with RQMD-v2.4 transport calculations to demonstrate the relevance of particle production as well as the longitudinal and transverse flow components. The formation of deuterons follows an approximate scaling law proportional to the relative freeze-out densities of nucleons and produced secondaries. For antideuterons, an additional suppression appears that is proportional to the number of nucleons, pointing toward multiple rescattering and absorption prior to freeze-out.Comment: RevTex, 4 pages, 2 figure

Deuteron production and space-momentum correlations at RHIC

We present predictions for the formation of (anti)nuclear bound states in Au+Au central collisions at $\sqrt{s}=200A$ GeV. The coalescence afterburner was applied to the freeze-out phase space distributions of nucleons provided by the transport model, RQMD version 2.4. We study the sensitivity of the deuteron spectra to space-momentum correlations. It is found that the deuteron transverse momentum distributions are strongly affected by the nucleon space-momentum correlations.Comment: 5 pages, 2 figures, (latex2e uses ws-p8-50x6-00.cls), talk presented at the Relativistic Heavy Ion Symposium at the APS Centennial Meeting, Atlanta, 199

Event Anisotropy in High Energy Nucleus-Nucleus Collisions

The predictions of event anisotropy parameters from transport model RQMD are compared with the recent experimental measurements for 158$A$ GeV Pb+Pb collisions. Using the same model, we study the time evolution of event anisotropy at 2$A$ GeV and 158$A$ GeV for several colliding systems. For the first time, both momentum and configuration space information are studied using the Fourier analysis of the azimuthal angular distribution. We find that, in the model, the initial geometry of the collision plays a dominant role in determining the anisotropy parameters

Extracting particle freeze-out densities and entropies from sources imaged in heavy-ion reactions

The space-averaged phase-space density and entropy per particle are bothfundamental observables which can be extracted from the two-particlecorrelation functions measured in heavy-ion collisions. Two techniques havebeen proposed to extract the densities from data: either by using the radiusparameters from Gaussian fits to meson correlations or by using source imaging,which may be applied to any like pair correlation. We show that the imaging andGaussian fits give the same result in the case of meson interferometry. Wediscuss the concept of an equivalent instantaneous source on which bothtechniques rely. We also discuss the phase-space occupancy and entropy perparticle. Finally, we propose an improved formula for the phase-space occupancythat has a more controlled dependence on the uncertainty of the experimentallymeasured source functions

Relative space-time asymmetries in pion and nucleon production in non-central nucleus-nucleus collisions at high energies

We propose to use the ratio of the pion-proton correlation functions evaluated under different conditions to study the relative space-time asymmetries in pion and proton emission (pion and nucleon source relative shifts) in high energy heavy ion collision. We address the question of the non-central collisions, where the sources can be shifted spatially both in the longitudinal and in the transverse directions in the reaction plane. We use the RQMD event generator to illustrate the effect and the technique

(Strange) Meson Interferometry at RHIC

We make predictions for the kaon interferometry measurements in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). A first order phase transition from a thermalized Quark-Gluon-Plasma (QGP) to a gas of hadrons is assumed for the transport calculations. The fraction of kaons that are directly emitted from the phase boundary is considerably enhanced at large transverse momenta K_T ~ 1 GeV/c. In this kinematic region, the sensitivity of the R_out/R_side ratio to the QGP-properties is enlarged. Here, the results of the 1-dimensional correlation analysis are presented. The extracted interferometry radii, depending on $K_T$, are not unusually large and are strongly affected by momentum resolution effects