Speaker
Description
Light nuclei have much smaller binding energy compared to the temperature of the system. Consequently, their distributions can be used to probe the freeze-out properties, such as correlation volume and local baryon density of the medium created in high-energy nuclear collisions.
In this talk, we report the results of deuteron and anti-deuteron production in Au-Au collision at $\sqrt{s_{NN}}$ = 7.7$-$200 GeV, measured by STAR at RHIC. The collision energy, centrality and transverse momentum dependence of the coalescence parameter $B_2$ for deuteron and anti-deuteron production is discussed. We find the values of $B_2$ for anti-deuteron are systematically lower than those for deuterons. The difference in $B_2$ for deuteron and anti-deuteron indicate the residual isospin brought in at the beginning of the collisions. The values of $B_2$ are found to decrease with increasing collision energy. The rate of decreasing seems to change around $\sqrt{s_{NN}}$ = 20 GeV implying a dramatic change of the equation of state of the medium in these collisions.
| Preferred Track | Baryon-Rich QCD Matter and Astrophysics |
|---|---|
| Collaboration | STAR |
