Little Higgs theory naturally predicts a light Higgs boson whose most important discovery channel at the LHC is the di-photon signal pp→h→γγ. In this work we perform a comparative study for this signal in some typical little Higgs models, namely the littlest Higgs model (LH), two littlest Higgs models with T-parity (named LHT-I and LHT-II) and the simplest little Higgs modes (SLH). We find that compared with the Standard Model prediction, the di-photon signal rate is always suppressed and the suppression extent can be quite different for different models. The suppression is mild (\lsim10) in the LH model but can be quite severe (≃90) in other three models. This means that discovering the light Higgs boson predicted by the little Higgs theory through the di-photon channel at the LHC will be more difficult than discovering the SM Higgs boson.
@article{arxiv.1106.3916,
title = {The LHC di-photon Higgs signal predicted by little Higgs models},
author = {Lei Wang and Jin Min Yang},
journal= {arXiv preprint arXiv:1106.3916},
year = {2013}
}