通往另一个世界的百万之窗
A Milli-Window to Another World
摘要：
超荷矢量玻色子与标准模型之外的粒子扇区相关的矢量玻色子的动力学混合是新物理学的最佳激发窗口之一。由此产生的现象取决于新的矢量玻色子是有质量的还是无质量的。近年来，随着许多理论探索和新的实验努力，与有质量相相关的现象学受到了相当大的关注，而无质量相则与毫荷电粒子的现象学有关。在本文中，我们介绍了更一般的情况下，动力学混合是一个矢量玻色子，这是一个有质量和无质量的状态的线性组合（超荷是在标准模型）。我们证明，一般相位只有弱约束时，与它相关的质量尺度是约100兆电子伏以上。最后，我们表明，最近在参考文献[1]中提出的LHC新的专用实验可以探索100 MeV和100 GeV之间质量范围内的大部分参数空间。特别是，它对仅在一般阶段出现的新签名具有独特的敏感性。
英文摘要：
The kinetic mixing of the vector boson of hypercharge with the vector boson(s) associated with particle sectors beyond the Standard Model is one of the best motivated windows to new physics. The resulting phenomenology depends on whether the new vector boson is massive or massless. The phenomenology associated with the massive phase has received considerable attention in recent years with many theoretical explorations and new experimental efforts, while the massless phase is linked to the phenomenology of milli-charged particles. In this paper we introduce the more general case where the kinetic mixing is with a vector boson that is a linear combination of both a massive and a massless state (as hypercharge is in the Standard Model). We demonstrate that the general phase is only weakly constrained when the mass scale associated with it is above about 100 MeV. Finally, we show that a new dedicated experiment at the LHC, proposed recently in Ref. [1], can explore large parts of the parameter space in the mass range between 100 MeV and 100 GeV. In particular, it is uniquely sensitive to a new signature that only arises in the general phase.
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