The Higgs Trilinear Coupling and the Scale of New Physics for the SM-Axion-Seesaw-Higgs portal inflation (SMASH) Model

C.R. Das; Katri Huitu; Timo Kärkkäinen

doi:10.20944/preprints202211.0538.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 28 November 2022 / Approved: 29 November 2022 / Online: 29 November 2022 (07:04:06 CET)
Version 2 : Received: 1 January 2023 / Approved: 4 January 2023 / Online: 4 January 2023 (02:16:15 CET)

In the extended scalar sector of the SMASH (Standard Model - Axion - Seesaw - Higgs portal inflation) framework, we conduct a phenomenological investigation of the observable effects. In a suitable region of the SMASH scalar parameter spaces, we resolve the vacuum metastability issue and discuss the one-loop correction to the triple Higgs coupling λHHH. The λHHH and SM Higgs quartic coupling λH corrections are found to be proportional to the threshold correction. A large λHHH correction (≳5%) implies vacuum instability in the model and thus limits the general class of theories that use threshold correction. We perform a full two-loop renormalization group analysis of the SMASH model.

Higgs portal inflation; Beyond the Standard Model; SMASH; Higgs triple coupling; Higgs trilinear coupling

Physical Sciences, Particle and Field Physics

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The Higgs Trilinear Coupling and the Scale of New Physics for the SM-Axion-Seesaw-Higgs portal inflation (SMASH) Model

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