Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers
Abstract
We study the scenarios where a strongly first-order electroweak phase transition (EWPT) is triggered by a light singlet scalar, which has feeble interactions to the Higgs. Since the singlet scalar is light and has weak couplings, it can decay at a macroscopic distance away from the collision point. Therefore, it can be regarded as a long-lived particles (LLP) in such scenarios. We perform the searches of the LLPs from the exotic Higgs decays, at the FASER, MAPP and CMS-Timing detectors of the 14 TeV HL-LHC, to probe the strongly first-order EWPT. In certain scenarios, we show that the LLP searches can help to reach the parameter space of the strongly first-order EWPT remarkably, where the searches for promptly exotic Higgs decays are not valid.
Keywords
Cite
@article{arxiv.2205.08205,
title = {Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers},
author = {Wei Liu and Aigeng Yang and Hao Sun},
journal= {arXiv preprint arXiv:2205.08205},
year = {2022}
}
Comments
14 pages, 7 figures, to be published in PRD