arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.09819hep-phhep-ex
收藏

整体电弱对称真空

Global Electroweak Symmetric Vacuum

Yang Bai, Seung J. Lee, Minho Son, Fang Ye

摘要:

虽然标准模型中的Higgs势在小场区域只包含一个简单的电弱对称破缺真空,但在标准模型之外的模型中可能存在额外的亚稳真空或整体真空。在本文中,我们研究了一个有趣的情况下,一个额外的电弱对称真空,可能是全球之一。对于终止于当前亚稳态真空的热宇宙,电弱对称性在高温下应该保持不可恢复。我们实现了一个模型中的场景与希格斯门耦合SM单重标量近似全球O(N)对称性与大N。对于模型参数空间的大部分,量子和热隧穿率都被抑制,使得我们目前的亚稳态真空足够长。我们的方案预测了希格斯粒子自耦合的一阶变化和对离壳希格斯粒子不可见衰变信号的巨大贡献。它可以在LHC运行3中部分探测,并在高亮度LHC中得到很好的测试。我们还讨论了亚临界(反德西特)气泡的热隧道,可能有一个大的人口和有趣的宇宙学意义。

英文摘要:

Although the Higgs potential in the Standard Model (SM) contains only a simple electroweak symmetry breaking vacuum in the small field region, additional metastable or global vacua could exist in models beyond the SM. In this paper, we study one intriguing scenario with an additional electroweak symmetric vacuum that could be the global one. For the thermal universe ending at the current metastable vacuum, the electroweak symmetry should stay non-restored at high temperatures. We realize the scenario in a model with Higgs-portal couplings to SM singlet scalars with approximately global O(N) symmetries with a large N. For a large portion of model parameter space, both the quantum and thermal tunneling rates are suppressed such that our current metastable vacuum is long-lived enough. Our scenario predicts order-one changes for the Higgs self-couplings and a large contribution to the signal of the off-shell Higgs invisible decay. It can be partly probed at the LHC Run 3 and well tested at the high luminosity LHC. We also discuss the subcritical (anti-de Sitter) bubbles from the thermal tunneling that could have a large population and interesting cosmological implications.

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。

↑