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Vector-like leptons and extra gauge symmetry for the natural Higgs boson

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Abstract

For raising the radiative Higgs mass without a serious fine-tuning in the Higgs sector, we introduce vector-like lepton doublets and neutral singlets {L, L c; N, N c}, and consider their order one Yukawa coupling to the Higgs W ⊃ y N Lh u N c. The 125 GeV Higgs mass can be naturally explained with the stop mass squared of ~ (500 GeV)2 and even without the A-term contributions. It is possible because of the quartic power of y N in the radiative Higgs mass correction, and much less stringent mass bounds on extra leptonic matter. In order to avoid blowup of y N at higher energy scales, a non-Abelian gauge extension of the MSSM is attempted, under which {L, L c; N, N c} are charged, while all the ordinary MSSM superfields remain neutral. We discuss the gauge coupling unification. This mechanism can be applied also for enhancing h 0 → γγ with W ⊃ y E L c h u E, if the charged lepton singlets {E, E c} are also introduced.

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Authors and Affiliations

  1. Department of Physics, Pusan National University, Busan, 609-735, Korea

    Bumseok Kyae

  2. Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk, 790-784, Korea

    Chang Sub Shin

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  1. Bumseok Kyae
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  2. Chang Sub Shin
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Correspondence to Bumseok Kyae.

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ArXiv ePrint: 1303.6703

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Kyae, B., Shin, C.S. Vector-like leptons and extra gauge symmetry for the natural Higgs boson. J. High Energ. Phys. 2013, 102 (2013). https://doi.org/10.1007/JHEP06(2013)102

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  • DOI: https://doi.org/10.1007/JHEP06(2013)102

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