The LHC di-photon Higgs signal predicted by little Higgs models

Abstract

Little Higgs theory naturally predicts a light Higgs boson whose most important discovery channel at the LHC is the di-photon signal $pp\to h\to \gamma \gamma$. 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 ($\lsim 10%$) in the LH model but can be quite severe ($\simeq 90$) 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.

17 pages, 4 figures, 1 table

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• 130 GeV gamma-ray line and enhancement of $h\to \gamma \gamma$ in the Higgs triplet model plus a scalar dark matter
• Novel universality and Higgs decay H -> γγ, gg in the SO(5) x U(1) gauge-Higgs unification
• The recent Higgs boson data and Higgs triplet model with vectorlike quarks
• Little Higgs theory confronted with the LHC Higgs data
• The Z+photon and diphoton decays of the Higgs boson as a joint probe of low energy SUSY models at LHC
• Pair production of a 125 GeV Higgs boson in MSSM and NMSSM at the ILC
• Dark matter in little Higgs model under current experimental constraints from LHC, Planck and Xenon
• Higgs decay to goldstini and its observability at the LHC
• A concise review on some Higgs-related new physics models in light of current experiments
• LHC diphoton and Z+photon Higgs signals in the Higgs triplet model with Y=0
• Flavor changing top quark decay and bottom-strange production in the littlest Higgs model with T-parity
• $Z_H\to H^0\gamma$ decay within the littlest Higgs model at $\mathcal{O}({\alpha }_{\mathrm{ew}}^3{\alpha }_s)$ accuracy
• Production and decay of for the 125 GeV Higgs boson in the littlest Higgs model with T-parity