利用NICA的MPD寻找重子-介子转变区
Searching for the baryon-to-meson transition region with the MPD at NICA
AI总结：
针对重离子反应中重子-介子比随碰撞能量快速转变的问题，提出利用NICA的MPD实验探索该转变区，通过蒙特卡罗样本开展介子与重子横动量谱测量的可行性研究，以分析横动量交点随中心度及碰撞能量的变化。
摘要：
在重离子反应中，统计模型预测重子-介子比会随碰撞能量发生快速变化。这种变化发生在强子介质从以重子为主的气体转变为以介子为主的气体时。该转变预计发生在约140 MeV的温度和约420 MeV的重子化学势下，对应的质心系碰撞能量为$\u2062√(s_{NN}) ≈ 8.2$ GeV。MPD实验的能量范围将适合探索这一转变区域。我们展示了利用蒙特卡罗数据样本测量介子和重子横动量谱的可行性研究初步结果，旨在研究这些横动量之间的交点随中心度和碰撞能量的变化关系。
英文摘要：
In heavy-ion reactions, statistical models predict a rapid change in the baryon-to-meson ratio as a function of the collision energy. This change occurs when the hadronic medium transits from a baryon- to a meson-dominated gas. The transition is expected to take place at a temperature around 140 MeV and a baryon chemical potential around 420 MeV, corresponding to a center-of-mass collision energy of $\sqrt{s_{NN}} \simeq 8.2$ GeV. The energy range of the MPD experiment will be suitable for the exploration of this transition region. We present preliminary results of feasibility studies for the measurement of the transverse momentum spectra for mesons and baryons, using Monte Carlo data samples, in order to study the crossing point between these transverse momenta, as a function of the centrality and collision energy.
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