Beam energy dependence of $d$ and $\bar{d}$ productions in Au+Au collisions at RHIC

Abstract

Light nuclei have much smaller binding energy compared to the temperature of the system created in heavy-ion collisions. Consequently, the distributions of light nuclei 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 paper, we report the results of deuteron and anti-deuteron production in Au+Au collision at $\sqrt{s_{\mathrm{NN}}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 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 are discussed. We find the values of $B_2$ for anti-deuteron are systematically lower than those for deuterons indicating the correlation volume of anti-baryon are larger than that of baryon. In addition, the values of $B_2$ are found to decrease with increasing collision energy and reach a minimum around $\sqrt{s_{\mathrm{NN}}}$ = 20 GeV implying a change of the equation of state of the medium in these collisions.

arXiv comment5 pages,6 figures

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• Multiplicity Scaling of Light Nuclei Production in Relativistic Heavy-Ion Collisions
• Production of Light Nuclei at Thermal Freezeout in Heavy-Ion Collisions
• Energy dependence of light (anti)nuclei and (anti)hypertriton production in the Au-Au collision from $\sqrt{s_{\mathrm{NN}}}=5.0$ to $5020$ GeV
• Production of light (anti)nuclei in pp collisions at $\sqrt{s}=13$ TeV
• Particle decay from statistical thermal model in high energy nucleus-nucleus collision
• Search for the QCD Critical Point by Transverse Velocity Dependence of Anti-deuteron to Deuteron Ratio