Production and decay of for the 125 GeV Higgs boson in the littlest Higgs model with T-parity

TL;DR

This paper analyzes Higgs boson production and decay in the littlest Higgs model with T-parity, finding potential enhancements in certain channels and suppressions in others, consistent with current LHC data.

Contribution

It provides a detailed study of Higgs signal strengths in the LHT model, highlighting possible deviations from the Standard Model in specific search channels.

Findings

Enhancement factor of 1.09-1.56 in the jjγγ channel for certain parameters.

Suppressed rates for bar{b} and τar{τ} channels compared to SM.

Results compatible with current LHC sensitivity, awaiting further testing.

Abstract

Motivated by recent search results for the standard model (SM) Higgs boson at the Large Hadron Collider (LHC), we revisit the Higgs phenomenology in the littlest Higgs model with T-parity (LHT). We present the signal strength modifier $\mu$ respectively for the main search channels $qq' \rightarrow jjh\rightarrow jj\gamma\gamma$, $qq'\rightarrow Vh\rightarrow V\gamma \gamma$, $qq'\rightarrow Vh \rightarrow Vbb$, $gg\rightarrow h \rightarrow \gamma\gamma$, and $gg \rightarrow h \rightarrow VV$ in the LHT model. It is found that an enhancement factor of $1.09-1.56$ in $qq' \rightarrow jjh\rightarrow jj\gamma\gamma$ channel can be obtained for this model in Case B with parameter $f$ in the range 1000 GeV$\sim 500$ GeV. However, the rates for $b\bar{b}$, $\tau\bar{\tau}$ are significantly suppressed relative to the SM predictions which are still consistent with the current sensitivity. It is hoped that will be further tested with larger integrated luminosity at the LHC.