Long-Lived Heavy Quarks: A Review
Long-Lived Heavy Quarks: A Review
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DOI：
10.1155/2013/690254
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发表时间：
2012-10
影响因子：
1.7
通讯作者：
M. Buchkremer;A. Schmidt
中科院分区：
文献类型：
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作者：
M. Buchkremer;A. Schmidt
我们回顾了标准模型的简单扩展中出现的长寿命重夸克或其束缚态的理论和实验情况。如果这些粒子在衰变之前传播很远的距离，它们就会产生需要专用分析方法的特定特征。特别是，与三个已知家族的耦合可以忽略不计的矢量夸克可能已经逃脱了过去的实验搜索。虽然大多数分析假设在产生顶点处发生快速衰变，但新的重夸克可能会导致涉及位移顶点、新的强子束缚态或在探测器可接受范围之外发生衰变的特征。我们对现有的短寿命和长寿命粒子搜索进行了重新解释，并就如何将其范围扩展到长寿命重夸克提出了建议。
We review the theoretical and experimental situation for long-lived heavy quarks, or bound states thereof, arising in simple extensions of the Standard Model. If these particles propagate large distances before their decay, they give rise to specific signatures requiring dedicated analysis methods. In particular, vector-like quarks with negligible couplings to the three known families could have eluded the past experimental searches. While most analyses assume prompt decays at the production vertex, novel heavy quarks might lead to signatures involving displaced vertices, new hadronic bound states, or decays happening outside of the detector acceptance. We perform reinterpretations of existing searches for short- and long-lived particles, and give suggestions on how to extend their reach to long-lived heavy quarks.