Abstract
We investigate the Higgs-strahlung production process e + e − → Zh at the future Higgs factory such as TLEP by including radiative corrections in the Minimal Dilaton Model (MDM), which extends the SM by one singlet scalar called dilaton. We consider various theoretical and experimental constraints on the model, and perform fits to the Higgs data taken from ATLAS, CMS and CDF+D0. Then for the 1σ surviving samples, we calculate the MDM predictions on the inclusive production rate σ(e + e − → Zh) at the 240-GeV Higgs factory, and also the signal rates of e + e − → Zh with the Higgs boson decaying to \( b\overline{b} \) and γγ. We have following observations: (1) In the heavy dilaton scenario, the deviation of σ(e + e − → Zh) from its SM prediction can vary from −15% to 85%, which mainly arises from the modification of the tree-level hZZ coupling and also the radiative correction induced by possibly large Higgs self-couplings. (2) The processes e + e − → Zh at the Higgs factory and pp → hh at 14-TeV LHC are complementary in limiting the MDM parameter space. Requiring the deviation of σ(e + e − → Zh) from its SM prediction to be less than 1% and that of σ(pp → hh) to be less than 50%, tan θ S in the MDM will be limited to be −0.1 < tanθ S < 0.3, and the deviations of the signal rates are constrained to be |\( {R}_{b\overline{b}} \)| < 2% and |R γγ | < 7%. Especially, the Higgs self-coupling normalized to its SM prediction is now upper bounded by about 4. (3) In the light dilaton scenario, the deviation of σ(e + e − → Zh) may reach −7%, and requiring its size to be less than 1% will result in 0 < tan θ S < 0.1, and −10% < \( {R}_{b\overline{b}} \) , R γγ < 1%.
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Cao, J., Heng, Z., Li, D. et al. Higgs-strahlung production process e + e − → Zh at the future Higgs factory in the Minimal Dilaton Model. J. High Energ. Phys. 2014, 138 (2014). https://doi.org/10.1007/JHEP08(2014)138
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DOI: https://doi.org/10.1007/JHEP08(2014)138