Higgs boson decays and production via gluon fusion at LHC in littlest Higgs models with T-parity

TL;DR

This paper investigates how Higgs boson decay and production processes at the LHC can distinguish between different littlest Higgs models with T-parity, highlighting potential deviations from the Standard Model predictions.

Contribution

It provides a comparative analysis of Higgs decay and production in two littlest Higgs models with T-parity, considering different Yukawa coupling choices, and assesses their experimental signatures.

Findings

Predictions vary significantly between models and Yukawa choices.

Higgs processes can deviate notably from Standard Model expectations.

LHC measurements can serve as sensitive tests for these models.

Abstract

We study the Higgs boson decays and production via gluon fusion at the LHC as a probe of two typical littlest Higgs models which introduce a top quark partner with different (even and odd) T-parity to cancel the Higgs mass quadratic divergence contributed by the top quark. For each model we consider two different choices for the down-type quark Yukawa couplings. We first examine the branching ratios of the Higgs boson decays and then study the production via gluon fusion followed by the decay into two photons or two weak gauge bosons. We find that the predictions can be quite different for different models or different choices of down-type quark Yukawa couplings and all these predictions can sizably deviate from the SM predictions. So the Higgs boson processes at the LHC can be a sensitive probe for these littlest Higgs models.