AI 中文总结
研究色单态夸克 - 反夸克对在介质中软胶子发射对矩阵元平方的直接贡献，通过纳入天线有限形成时间内的介质相互作用来计算，发现与旁观者支路有关联，结果与瞬时天线形成极限有偏差。
AI 中文摘要
我们计算了色单态夸克 - 反夸克对在介质中软胶子发射对矩阵元平方的直接贡献。为此，我们纳入了在天线有限形成时间内发生的介质相互作用，从而考虑了相对于真空基线很大程度上被忽略的修正源。结果，与天线旁观者（即非发射）支路出现非平凡关联，即使在领先的\(N_c\)阶也大大增加了结果的复杂性。观察到的修正与瞬时天线形成的极限有显著偏差，在瞬时形成极限下计算有效简化为著名的BDMPS-Z谱。
英文摘要
We compute the direct contribution to the squared matrix element for the in-medium soft gluon emission off a color-singlet quark-antiquark pair. To do this, we incorporate medium interactions that take place during the finite formation time of the antenna, thereby accounting for a largely neglected source of modifications with respect to the vacuum baseline. As a consequence, non-trivial correlations with the spectator (i.e.\ non-emitting) leg of the antenna emerge, greatly increasing the complexity of the result even at leading-$N_c$ order. The observed modifications entail a significant departure from the limit of instantaneous antenna formation, where the calculation effectively reduces to the well-known BDMPS-Z spectrum.
Comments32 pages, 6 figures
