标题： 为什么重夸克和轻夸克以相似的速率辐射能量 显示英文标题

标题： Why heavy and light quarks radiate energy with similar rates

摘要： 在重离子碰撞中，对于以大pT产生的重夸克，预期死锥效应会减小能量损失和喷注淬火的幅度。 相反，RHIC的开放魅夸克产生数据表明存在与味无关的核抑制。 我们表明，在高pT下产生且其色场被剥离的高虚性夸克的真空辐射，会产生一个更宽的死锥，这会屏蔽与夸克质量相关的死锥。 由于缺乏色场，胶子不能在此锥内辐射，直到色场重新生成，夸克的虚性冷却到夸克质量量级。 然而，这需要的时间比观察到的喷注淬火所需的时间更长。 这就是为什么轻夸克和魅夸克喷注被同样淬火的原因。 在目前研究的pT范围内，开放底夸克预计会被抑制得少得多。 显示英文摘要

摘要： The dead cone effect has been expected to reduce the magnitude of energy loss and jet quenching for heavy flavors produced with large pT in heavy ion collisions. On the contrary, data from RHIC for open charm production demonstrate a flavor independent nuclear suppression. We show that vacuum radiation of a highly virtual quark produced at high pT with its color field stripped off, develops a much wider dead cone, which screens the one related to the quark mass. Lacking the field, gluons cannot be radiated within this cone until the color field is regenerated and the quark virtuality cools down to the scale of the order of the quark mass. However, this takes time longer than is essential for the observed jet quenching. This is the reason why the light and charm quark jets are quenched equally. Open beauty is expected to be suppressed much less within the pT range studied so far.