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arXiv · 2205.08205

Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers

Wei Liu·Aigeng Yang·Hao Sun
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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.

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Wei Liu, Aigeng Yang, Hao Sun. 2022-05-17. Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers. https://doi.org/10.1103/physrevd.105.115040

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