Higgs-pair Production in Littlest Higgs Model with T-parity

TL;DR

This paper investigates how Higgs-pair production at the LHC is affected by the littlest Higgs model with T-parity, showing significant enhancements over the Standard Model due to new loop contributions from T-even and T-odd quarks.

Contribution

It provides the first detailed calculation of Higgs-pair production rates including both T-even and T-odd quark contributions in the littlest Higgs model with T-parity.

Findings

Production rate can be significantly enhanced compared to the SM.

T-odd quark contributions are as important as T-even contributions.

Rate can exceed that in the minimal supersymmetric model.

Abstract

The Higgs-pair production process at the CERN Large Hadron Collider (LHC), which will provide a way to test the Higgs boson self-coupling, may be sensitive to new physics. In the framework of the littlest Higgs model with T-parity, such Higgs-pair production can proceed through additional loop diagrams and thus the production rate can be quite different from the Standard Model (SM) prediction. Our calculations show that, due to the loop contributions of both T-even and T-odd quarks predicted in this model, the production rate can be significantly enhanced relative to the SM prediction and also can be larger than the production rate in the minimal supersymmetric model. Also, we find that the T-odd quark contributions, which were ignored in a previous study, are equally important compared with the T-even quark contributions.