The Higgs Particle and Higher-Dimensional Theories
The Higgs Particle and Higher-Dimensional Theories
复制标题
希格斯粒子和高维理论
DOI：
10.1093/ptep/ptt083
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
C.S. Lim
中科院分区：
文献类型：
--
作者：
Kishimoto;T.;et al.;C.S. Lim
尽管大型强子对撞机实验取得了巨大的成功，但我们不知道所发现的类似标准模型的希格斯粒子是否真的是标准模型所预测的，或者是一些新物理在其低能有效理论中所拥有的粒子。此外，关于希格斯粒子的性质及其相互作用的长期存在的问题仍然存在，我们仍然没有关于希格斯粒子本身的起源的任何确凿的争论。在这篇文章中，我们关注作为新物理学的高维理论。首先，我们简要回顾了它们的代表性场景和密切相关的4D场景。其中，我们主要讨论了希格斯起源的两种有趣的可能性：作为规范玻色子的希格斯和作为(伪)Nambu-Goldstone玻色子的希格斯。其次，我们认为新物理理论分为两类，即具有正常Higgs相互作用的理论和具有反常Higgs相互作用的理论。有趣的是，上面提到的希格斯起源的两个候选者都预测了希格斯相互作用的特点，例如汤川耦合与标准模型预测的偏差。这样的偏差有望通过计划中的ILC实验中的希格斯相互作用的精确测试来调查。还讨论了希格斯粒子的主要衰变模式。再一次，属于不同类别的理论被认为预测了对这一重要过程的显著不同的新的物理贡献。
In spite of the great success of LHC experiments, we do not know whether the discovered “standard model-like” Higgs particle is really what the standard model predicts, or a particle that some new physics has in its low-energy effective theory. Also, the long-standing problems concerning the property of the Higgs and its interactions are still there, and we still do not have any conclusive argument on the origin of the Higgs itself. In this article we focus on higher-dimensional theories as new physics. First we give a brief review of their representative scenarios and closely related 4D scenarios. Among them, we mainly discuss two interesting possibilities of the origin of the Higgs: the Higgs as a gauge boson and the Higgs as a (pseudo) Nambu–Goldstone boson. Next, we argue that theories of new physics are divided into two categories, i.e., theories with normal Higgs interactions and those with anomalous Higgs interactions. Interestingly, both the candidates for the origin of the Higgs mentioned above predict characteristic “anomalous” Higgs interactions, such as the deviation of the Yukawa couplings from the standard model predictions. Such deviations can hopefully be investigated by precision tests of Higgs interactions at the planned ILC experiment. Also discussed is the main decay mode of the Higgs,. Again, theories belonging to different categories are known to predict remarkably different new physics contributions to this important process.