The Analytical One-Loop Contributions to Higgs Boson Mass in the Supersymmetric Standard Model with Vector-like Particles

TL;DR

This paper analytically calculates one-loop contributions to the Higgs boson mass in an extended MSSM with vector-like particles, revealing decoupling effects and constraints from Higgs mass measurements.

Contribution

It derives the particle spectra, Feynman rules, and one-loop Higgs mass corrections in MSSM with VLPs, including decoupling behavior and phenomenological implications.

Findings

Corrections depend on mass splittings between quarks and squarks.

Existence of a (partial) decoupling limit for VLPs.

Higgs mass around 125 GeV constrains VLP parameters.

Abstract

In the Minimal Supersymmetric Standard Model (MSSM) with additional vector-like particles (VLPs), we for the first time derive the particle mass spectra and the Feynman rules, as well as analytically calculate the one-loop contributions to the Higgs boson mass from the fermions and sfermions. After discussing and numerically analysing a cases without bilinear terms and a case with a (partial) decoupling limit, we find: (i) The corrections depend on the mass splittings between quarks and squarks and between vector-like fermions and their sfermions; (ii) There exists the (partial) decoupling limit, where the VLPs decouple from the electrwoeak (EW) energy scale, even when one of the VLPs is light around the EW scale. The reason is that the contributions to Higgs mass can be suppressed by the (or partial) decoupling effects, which can make the EW phenomenology very different from the MSSM; (iii) The SM-like Higgs boson with mass around 125 GeV gives strong constraints on the VLPs if the top squarks are around 1~TeV. Moreover, we present some numerical analyses to understand these unique features.