标题： 手性对称性恢复对重离子碰撞中双轻子产生的影响 显示英文标题

标题： Effects of chiral symmetry restoration on dilepton production in heavy ion collisions

摘要： 由于其与相对论重离子碰撞产生的强相互作用物质的相互作用很弱，双轻子为研究这些碰撞的早期动力学提供了理想的探针。 在这里，我们使用基于扩展的 Nambu-Jona-Lasinio (NJL) 模型的部分子输运模型来研究双轻子的产生。 在这个模型中，随着温度的升高，由于手征对称性的恢复，介质中的夸克质量减小。 我们发现从中等质量双轻子提取出的温度与部分子物质的温度很好地吻合，这表明双轻子的产生可以作为部分子物质的测温计。 我们的结果还表明，从中等质量双轻子提取的介质中的夸克质量随着双轻子温度的升高而减小，这意味着双轻子的产生还可以进一步作为高能重离子碰撞中手征对称性恢复的探针。 显示英文摘要

摘要： Because of their weak interactions with the strongly interacting matter produced in relativistic heavy-ion collisions, dileptons provide an ideal probe of the early dynamics of these collisions. Here, we study dilepton production using a partonic transport model that is based on an extended Nambu-Jona-Lasinio (NJL) model. In this model, the in-medium quark masses decrease with increasing temperature as a result of the restoration of chiral symmetry. We find that the extracted temperature from dileptons of intermediate masses agrees well with the temperature of the partonic matter, suggesting that dilepton production can be used as a thermometer for the produced partonic matter. Our results also indicate that the extracted in-medium quark masses decrease with increasing dilepton temperature, implying that dilepton production can further serve as a probe of chiral symmetry restoration in high energy heavy-ion collisions.