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Unitarity and vacuum stability constraints on the couplings of color octet scalars

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Abstract

The recent discovery of a 126 GeV boson at the LHC will be followed by a detailed examination of its couplings in order to determine whether this particle is the Higgs boson of the standard model or one of many particles of an extended scalar sector. One such extension with a rich phenomenology consists of a color octet electroweak doublet scalar. The most general renormalizable scalar potential contains twelve new parameters and it is therefore desirable to constrain them. We present theoretical constraints on these parameters obtained by requiring perturbative unitarity for two-to-two scalar scattering amplitudes at high energy and vacuum stability.

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Authors and Affiliations

  1. Physics Division, National Center for Theoretical Sciences, Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

    Xiao-Gang He & Yong Tang

  2. INPAC, Department of Physics, Shanghai Jiao Tong University, Shanghai, China

    Xiao-Gang He

  3. CTS, CASTS and Department of Physics, National Taiwan University, Taipei, Taiwan

    Xiao-Gang He

  4. Department of Physics, Iowa State University, Ames, IA, 50011, U.S.A

    Han Phoon & German Valencia

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  1. Xiao-Gang He
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  2. Han Phoon
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  4. German Valencia
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Correspondence to Xiao-Gang He.

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ArXiv ePrint: 1303.4848

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He, XG., Phoon, H., Tang, Y. et al. Unitarity and vacuum stability constraints on the couplings of color octet scalars. J. High Energ. Phys. 2013, 26 (2013). https://doi.org/10.1007/JHEP05(2013)026

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