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arXiv 0909.3113hep-ph
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标准模型的最小B-L扩张的唯象

Phenomenology of the minimal B-L extension of the Standard Model

L. Basso, A. Belyaev, S. Moretti, G. M. Pruna, C. H. Shepherd-Themistocleous

摘要:

我们提出了大型强子对撞机(LHC)的$Z'$和重中微子部门的$U(1)_{B-L}$扩大标准模型也包括三个重马约拉纳中微子的发现潜力。这个模型在大型强子对撞机上展示了新的特征,最有趣的是由涉及重中微子的$Z'$衰变链产生的,最终衰变为轻子和喷流。特别是,这个特征可以用来测量$Z'$和重中微子的质量。此外,在参数空间的大范围内,重中微子是相当长寿命的粒子,产生独特的位移顶点,可以在探测器中看到。最后,同时测量重中微子的质量和衰变长度,可以估算出轻中微子的绝对质量。为了完整起见,我们还将比较大型强子对撞机和未来的线性对撞机(LC)的发现潜力。

英文摘要:

We present the Large Hadron Collider (LHC) discovery potential in the $Z'$ and heavy neutrino sectors of a $U(1)_{B-L}$ enlarged Standard Model also encompassing three heavy Majorana neutrinos. This model exhibits novel signatures at the LHC, the most interesting arising from a $Z'$ decay chain involving heavy neutrinos, eventually decaying into leptons and jets. In particular, this signature allows one to measure the $Z'$ and heavy neutrino masses involved. In addition, over a large region of parameter space, the heavy neutrinos are rather long-lived particles producing distinctive displaced vertices that can be seen in the detectors. Lastly, the simultaneous measurement of both the heavy neutrino mass and decay length enables an estimate of the absolute mass of the parent light neutrino. For completeness, we will also compare the LHC and a future Linear Collider (LC) discovery potentials.

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