Quark Matter 2017

Beam energy dependence of deuteron and anti-deuteron productions in Au+Au collisions at RHIC

7 Feb 2017, 17:10

20m

Regency A

Oral Baryon-Rich QCD Matter and Astrophysics Parallel Session 4.1: Baryon-Rich QCD Matter and Astrophysics (I)

Speaker

Ning Yu (Central China Normal University CCNU)

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.

Presentation materials

Deuteron production-Ning Yu.pdf