arXiv 0907.15352009-07-09hep-phhep-th

异常、U（1）'和MSSM

Anomalies, U(1)' and the MSSM

Antonio Racioppi

备注：: 145 pages, 29 figures, feynmf, [dvipdfm]{hyperref}, PhD Thesis (Advisor: F. Fucito), University of Rome Tor Vergata

摘要：

这篇论文回顾了MSSM的一个扩展，通过添加一个反常阿贝尔向量多重态，并包含了一些有关反常$Z'$的唯象学的原始结果。综述部分介绍了MSSM的主要特点，讨论了手征反常，以及如何在标准模型和Green-Schwarz机制中消除手征反常。然后，给出了原始结果。我们建立拉格朗日的最小异常$U(1)'$扩展的MSSM的异常被取消的格林-施瓦茨机制和添加陈-西蒙斯条款，强调我们的模型和MSSM之间的主要区别。这种选择相对于标准选择的优点在于，它允许额外U（1）的量子数为任意值。作为研究强子湮灭在末态产生四个轻子的第一步（一个干净的信号，可以在大型强子对撞机上研究），我们然后计算衰变$Z'\to Z_0 \g$和$Z'\to Z_0 Z_0$。我们发现，衰变率的最大值是$\sim 10^{-4}$ GeV，而预期的事件数，每年在大型强子对撞机是在最多的顺序为10。然后，我们用一个新的暗物质候选者，轴子，这是理论的LSP，计算我们的模型预测的遗迹密度。我们发现协议的实验数据承认一个比诺-higgsino NLSP或一个类似的葡萄酒NLSP，几乎退化的质量的axino。

英文摘要：

This Thesis reviews an extension of the MSSM by the addition of an anomalous abelian vector multiplet and contains some original results concerning the phenomenology of an anomalous $Z'$. The review part covers an introduction of the MSSM focusing on its main features, a discussion on the chiral anomalies and how to cancel them in the Standard Model and by the Green-Schwarz mechanism. Then, the original results are presented. We build the Lagrangian for the Minimal Anomalous $U(1)'$ Extension of the MSSM where the anomalies are cancelled by the Green-Schwarz mechanism and the addition of Chern-Simons terms, stressing the main differences between our model and the MSSM. The advantage of this choice over the standard one is that it allows for arbitrary values of the quantum numbers of the extra U(1). As a first step towards the study of hadron annihilations producing four leptons in the final state (a clean signal which might be studied at LHC) we then compute the decays $Z'\to Z_0 \g$ and $Z'\to Z_0 Z_0$. We find that the largest values of the decay rate are $\sim 10^{-4}$ GeV, while the expected number of events per year at LHC is at most of the order of 10. Then we compute the relic density predicted by our model with a new dark matter candidate, the axino, which is the LSP of the theory. We find agreement with experimental data admitting a bino-higgsino NLSP or a wino-like NLSP, almost degenerate in mass to the axino.

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摘要：

英文摘要：

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