关于更新后的CDF“Ghost”事件的评论
Comment on the Updated CDF "Ghost" Events
摘要：
2008年，CDF协作组宣布发现了大量含有两个或更多μ子的事件，由于其不寻常的性质，被称为“幽灵”事件。在最近的一次更新中，CDF发现主（触发）μ子之间的方位角分布比所有已知的双μ子背景源的方位角分布要明显更多。在这里，我们表明，这种角分布不能复制的模型中产生的μ子在相对轻的X粒子的衰变：这种类型的所有模型也预测一个更广泛的分布比CDF发现。我们的结论是，CDF测量不能通过强相互作用部分子的湮灭来描述，因此似乎与QCD的基本原则相冲突。
英文摘要：
In 2008 the CDF Collaboration announced the discovery of an excess of events with two or more muons, dubbed "ghost" events for their unusual properties. In a recent update, CDF finds that the azimuthal angle distribution between the primary (trigger) muons is significantly more back-to-back than that of all known sources of di-muon backgrounds. Here we show that this angular distribution cannot be reproduced in models where the muons are produced in the decays of relatively light X-particles: all models of this kind also predict a much broader distribution than that found by CDF. We conclude that the CDF measurement cannot be described via the annihilation of strongly interacting partons, and thus seems to be in conflict with basic tenets of QCD.
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