标题： 高能核-核碰撞中的过量双轻子 显示英文标题

标题： Excess Dileptons in High-Energy Nucleus-Nucleus Collisions

摘要： 最近观察到，在高能$pA$碰撞中连续体双轻子产生和开放奇夸克产生可以用$pp$碰撞的叠加来描述，但 S+U 碰撞中的双轻子产率超过了类似的外推结果。 这一特征可以解释为不同软重子-重子碰撞中产生的胶子相互作用，导致在核-核碰撞中产生额外的开放奇夸克对，但在$pA$碰撞中则不会。 显示英文摘要

摘要： It has been observed recently that while continuum dilepton production and open charm production in high-energy $pA$ collisions can be described in terms of the superposition of $pp$ collisions, dilepton yields in S+U collisions are in excess of similar extrapolations. This feature can be explained as arising from the interaction of gluons produced in different soft baryon-baryon collisions, leading to additional open-charm pairs in nucleus-nucleus collisions but not in $pA$ collisions.