arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.03809hep-ph
收藏

小希格斯赝轴子的唯象学

Phenomenology of A Little Higgs Pseudo-Axion

Kingman Cheung, Shi-Ping He, Ying-nan Mao, Po-Yan Tseng, Chen Zhang

备注：
26 pages, 13 figures. Typos corrected, matched to journal version
发表信息：
Phys. Rev. D 98, 075023 (2018)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

在希格斯玻色子被实现为具有某种全局对称性破缺的伪南布-戈德斯通玻色子（pNGB）的模型中，通常存在某些$U(1)$群（称为“伪轴子”）的剩余pNGB，这可能导致这种情况的确凿证据，并提供关于电弱对称性破缺机制的重要线索。作为一个具体的例子，我们研究了无反常的最简单小希格斯（SLH）模型中的赝轴子现象。在澄清了对称矢量-标量-标量（VSS）顶点（例如$Z_μ(H\partial^μη+η\partial^μH)$）的影响的一个微妙的问题后，我们表明，在参数空间中的自然区域，SLH赝轴子是亲顶的，几乎只衰变到一对顶夸克。在$14\,\mbox{TeV}$（HL-）大型强子对撞机上直接和间接（即通过重粒子衰变）产生这样的赝轴子，结果要么受到大背景的影响，要么受到小速率的影响，这使得它的检测非常具有挑战性。因此，具有更高能量和亮度的$pp$对撞机，如$27\,\mbox{TeV}$ HE-LHC，甚至$100\,\mbox{TeV}$ FCC-hh或SppC，都有动力捕获这种pNGB的踪迹。

英文摘要：

In models where the Higgs is realized as a pseudo-Nambu-Goldstone boson (pNGB) of some global symmetry breaking, there are often remaining pNGBs of some $U(1)$ groups (called `pseudo-axions'), which could lead to smoking gun signatures of such scenarios and provide important clues on the electroweak symmetry breaking mechanism. As a concrete example, we investigate the phenomenology of the pseudo-axion in the anomaly-free Simplest Little Higgs (SLH) model. After clarifying a subtle issue related to the effect of symmetric vector-scalar-scalar (VSS) vertices (e.g. $Z_μ(H\partial^μη+η\partial^μH)$), we show that for natural region in the parameter space, the SLH pseudo-axion is top-philic, decaying almost exclusively to a pair of top quarks. The direct and indirect (i.e. via heavy particle decay) production of such a pseudo-axion at the $14\,\mbox{TeV}$ (HL-)LHC turn out to suffer from either large backgrounds or small rates, making its detection quite challenging. A $pp$ collider with higher energy and luminosity, such as the $27\,\mbox{TeV}$ HE-LHC, or even the $100\,\mbox{TeV}$ FCC-hh or SppC, is therefore motivated to capture the trace of such a pNGB.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑