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arXiv 1305.2641hep-ph
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左右镜模型框架下镜费米子的对撞机特征

Collider signatures of mirror fermions in the framework of Left Right Mirror Model

Shreyashi Chakdar, Kirtiman Ghosh, S. Nandi, Santosh Kumar Rai

备注：
26 pages, 11 figures
发表信息：
Phys. Rev. D 88,095005(2013)
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摘要：

从对称性的观点来看，镜像费米子的左右对称性是非常吸引人的。与标准模型不同的是，在这幅图中，对称性不仅是左右对称的，而且每个左手费米子多重态都伴随着新的右手费米子多重态。在这项工作中，我们考虑规范对称性，$SU(3)_c \otimes SU(2)_L\otimes SU(2)_R \otimes U(1)_{Y^\prime}$补充离散$Z_2$对称性。与通常的左右模型不同，镜像模型包含了包含新费米子的右手二重态（称为镜像），而对于每个右手单线态，都有相应的镜像单线态。因此，该模型中自然不存在规范反常，而且由于宇称守恒，该模型也为强CP问题提供了一个解决方案。对称性破缺的第一阶段是通过一个真空期望值为$\simeq 10^7$ GeV的二重镜希格斯子来实现的，这是解释中微子质量$\simeq 10^{-11}$ GeV所必需的。镜像费米子可以通过一个在规范对称下为单态的标量与普通费米子混合。在这个模型中，只有质量在几百GeV范围内的光镜粒子才是具有明确光谱的$\hat{e}, \hat{u}, \hat{d}$。$\hat{u}$和$\hat{d}$可以在LHC成对产生，并且可以作为（$u Z$）和（$d Z$）共振被检测。我们讨论了这些镜像费米子在大型强子对撞机上的信号，发现在大型强子对撞机上可以达到$m_{\hat q}\simeq 800$ GeV。

英文摘要：

The idea of left-right symmetry with mirror fermions is very appealing from the symmetry point of view. In this picture, unlike the Standard Model, the symmetry is not only left-right symmetric, but each left handed fermion multiplet is accompanied by new right handed fermion multiplet of opposite chirality. In this work, we consider a gauge symmetry, $SU(3)_c \otimes SU(2)_L\otimes SU(2)_R \otimes U(1)_{Y^\prime}$ supplemented by a discrete $Z_2$ symmetry. Instead of having right handed multiplets for each left handed multiplets of the same fermions as in the usual left-right model, the mirror model include right handed doublets involving new fermions (called mirrors), and similarly for each right handed singlet, there are corresponding mirror singlets. Thus the gauge anomaly is naturally absent in this model, and the model also provide a solution for the strong CP problem because of parity conservation. The first stage of symmetry breaking is achieved by a doublet mirror Higgs with a vacuum expectation value $\simeq 10^7$ GeV, needed to explain the neutrino mass $\simeq 10^{-11}$ GeV. The mirror fermions can mix with the ordinary fermions via a scalar which is singlet under the gauge symmetry. In this model, only light mirror particles, having masses in the few hundred GeV range are $\hat{e}, \hat{u}, \hat{d}$ with well-defined spectrum. $\hat{u}$ and $\hat{d}$ can be pair produced at the LHC, and can be detected as ($u Z$) and ($d Z$) resonances. We discuss the signals of these mirror fermions at the LHC, and find that the reach at the LHC can be as large as $m_{\hat q}\simeq 800$ GeV.

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