Outline

1.   Abstract
2.   Motivation
3.   Figures
4.   Summary
5.   Supporting-materials
6.  Questions-in-PWGC-preview

Abstract

Motivation

Figures

Fig. 1: The density distributions in transverse momentum (pT) and particle rapidity (y) for proton (a), Λ (b) and Ξ- (c) in 3.0 GeV Au+Au collisions.
A momentum cut with p < 2 GeV/c is applied in proton selection by TPC. Correlation functions are measured within the pT-y regions shown by the box. 

Fig. 2: Collision centrality dependence of the correlation functions for mid-rapidity (−0.5 < y < 0) pairs of p−p (left panel)
and p−Λ (middle panel) from 3 GeV Au+Au collisions. For p−Ξ- (right panel) correlation function, only 0-60% result is available
due to the limitation in statistics. Symbols, solid lines and dashed lines represent the results from experiment, fitting results of
Lednický-Lyuboshitz (LL) model and UrQMD model calculation, respectively. Vertical bar and band on data points represent statistical and
systematic uncertainty,  respectively.

Fig. 3: Extracted strong interaction parameters (f0, d0) from p-p and p−Λ correlation functions in 3.0 GeV Au+Au collisions.
For p-p pairs, the resulting 3-σ contour-lines for 0-10% (dot-dashed line), 10-20% (short-dashed line), 20-40% (solid line) and
40-60% (dotted line) centrality bins and rapidity windows of [-0.5, 0] (blue), [-0.75, -0.5] (red) and [-1.0, -0.75] (gray) are shown
in the right and insert. For p−Λ pairs, due to limited statistics, only 1-σ contours from three centrality bins 0-10 % (dot-dashed line),
10-20% (short-dashed line), 20-60% (long dashed line) and two rapidity windows [-0.5, 0] (blue) and [-0.75, -0.5] (red) are shown.
Black stars and solid lines represent the results of combined fits: while the size parameters vary as a function of collision centrality and
different rapidity windows, only one set of the strong interaction parameter (f0, d0) is extracted for given sets of correlation functions. 

Fig. 4: Left panel: Mid-rapidity (-0.5 < y < 0) source size parameter, shown as a function of collision centrality, for p-p and p−Λ pairs
from = 3.0 GeV Au+Au collisions. Solid and open symbols represent the results extracted from the LL fitting to experimental data and the UrQMD
calculations, respectively. A Gaussian type single particle space distribution is assumed in the LL fit. All source-size parameters are extracted as the
RMS of pair space distribution in the pair rest frame. For data, both statistical and systematic uncertainties are included in the plot but not visible.
Right panel: Solid circles represent the final state strong interaction parameters (f0, d0) extracted from p-p and p−Λ correlation functions.
Open triangles represent the predictions from model calculations. Brown square denotes the value from low energy scattering experiment.
1-σ contours are shown for both p-p and p−Λ pairs.

Summary