October 31, 2022 to November 4, 2022
CERN
Europe/Zurich timezone

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

Nov 4, 2022, 2:20 PM
20m
CERN

CERN

Speaker

Wei Liu (Nanjing University of Science and Technology)

Description

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 particle (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.

Primary author

Wei Liu (Nanjing University of Science and Technology)

Presentation materials