Search for QCD critical point by transverse velocity dependence of anti-deuteron to deuteron ratio

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 53-57
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/1/014002

摘要

We propose the transverse velocity (βT) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions.The QCD critical point can attract the system evolution trajectory in the QCD phase diagram,which is known as the focusing effect.To quantify this effect,we employ the thermal and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near the critical point.We found that the focusing effect can lead to anomalous βT dependence on (p)/p,(d)/dand 3(He)/3He ratios.We examined the βT dependence of (p)/p and (d)/d ratios of central Au+Au collisions at √sNN =7.7 to 200 GeV measured by the STAR experiment at RHIC.Surprisingly,we only observe a negative slope in βT dependence of (d)/d ratio at √sNN =19.6 GeV,which indicates the trajectory evolution has passed through the critical region.In the future,we could constrain the location of the critical point and/or width of the critical region by conducting precise measurements on the βT dependence of the (d)/d ratio at different energies and rapidity.