在大型强子对撞机上来自相交膜的轴子和去耦手征费米子
Axions from Intersecting Branes and Decoupled Chiral Fermions at the Large Hadron Collider
摘要：
我们提出了一类有效的行动，表现出典型的轴子相互作用的研究，并在大型强子对撞机的可能影响。这些模型的一个重要特点是存在一个赝标，这是一个推广的Peccei-Quinn轴子。这可以是非常轻和非常弱的耦合，其质量与其与规范场的耦合无关，由Wess Zumino相互作用描述。我们讨论了这些模型的两个独立的实现，一个来自相交膜的理论，第二个通过解耦每一代手征费米子（一个右手中微子）从一个无异常的母理论。使用一个简单的例子来说明这第二种实现的关键特征。交叉膜的电荷分配可以很容易地再现手征去耦的方法，它仍然是更一般的水平上的解决方案的异常方程。使用考虑其寿命的基础上，我们表明，在膜模型的轴子可以是暗物质，只有当它的质量是超轻（$\sim 10^{-4}$ eV），而在费米子去耦的情况下，它可以达到GeV区域，由于没有费米子耦合之间的重希格斯和轻费米子光谱。对于来自膜模型的GeV的轴子，我们提出了一个详细的讨论，其生产率在大型强子对撞机。
英文摘要：
We present a study of a class of effective actions which show typical axion-like interactions, and of their possible effects at the Large Hadron Collider. One important feature of these models is the presence of one pseudoscalar which is a generalization of the Peccei-Quinn axion. This can be very light and very weakly coupled, with a mass which is unrelated to its couplings to the gauge fields, described by Wess Zumino interactions. We discuss two independent realizations of these models, one derived from the theory of intersecting branes and the second one obtained by decoupling one chiral fermion per generation (one right-handed neutrino) from an anomaly-free mother theory. The key features of this second realization are illustrated using a simple example. Charge assignments of intersecting branes can be easily reproduced by the chiral decoupling approach, which remains more general at the level of the solution of its anomaly equations. Using considerations based on its lifetime, we show that in brane models the axion can be dark matter only if its mass is ultralight ($\sim 10^{-4}$ eV), while in the case of fermion decoupling it can reach the GeV region, due to the absence of fermion couplings between the heavy Higgs and the light fermion spectrum. For a GeV axion derived from brane models we present a detailed discussion of its production rates at the LHC.
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