Higgs-pair Production and Decay in Simplest Little Higgs Model

TL;DR

This paper investigates Higgs-pair production in the simplest little Higgs model at the LHC, revealing significant deviations from the Standard Model in production rates and decay modes, with implications for distinguishing new physics models.

Contribution

It provides the first detailed analysis of Higgs-pair production and decay channels in the SLHM, comparing results with the littlest Higgs model and the Standard Model.

Findings

Higgs-pair production rate can be significantly larger than SM prediction in SLHM.

Dominant decay mode for low Higgs mass is hh->ηηηη, with other sizable channels.

Production and decay rates differ markedly between SLHM and LHT, especially for light Higgs.

Abstract

In the framework of the simplest little Higgs model (SLHM), we study the production of a pair of neutral CP-even Higgs bosons at the LHC. First, we examine the production rate and find that it can be significantly larger than the SM prediction. Then we investigate the decays of the Higgs-pair and find that for a low Higgs mass their dominant decay mode is hh->\eta\eta\eta\eta (\eta is a CP-odd scalar) while hh->b\bar{b}\eta\eta and hh->\eta\eta WW may also have sizable ratios. Finally, we comparatively study the rates of pp-> hh -> b\bar{b}\tau^+ \tau^-, pp->hh->b\bar{b}\gamma\gamma, and pp->hh->WWWW in the SLHM and the littlest Higgs models (LHT). We find that for a light Higgs, compared with the SM predictions, all the three rates can be sizably enhanced in the LHT but severely suppressed in the SLHM; while for an intermediately heavy Higgs, both the LHT and SLHM can enhance sizably the SM predictions.