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  • Light composite scalar in e...
    Aoki, Yasumichi; Aoyama, Tatsumi; Kurachi, Masafumi; Maskawa, Toshihide; Miura, Kohtaroh; Nagai, Kei-ichi; Ohki, Hiroshi; Rinaldi, Enrico; Shibata, Akihiro; Yamawaki, Koichi; Yamazaki, Takeshi

    Physical review. D, Particles, fields, gravitation, and cosmology, 06/2014, Letnik: 89, Številka: 11
    Journal Article

    We present the first observation of a flavor-singlet scalar meson as light as the pion in N sub(functionof) = 8 QCD on the lattice, using the highly improved staggered quark action. Such a light scalar meson can be regarded as a composite Higgs with mass 125 GeV. In accord with our previous lattice results showing that the theory exhibits walking behavior, the light scalar may be a technidilaton, a pseudo-Nambu-Goldstone boson of the approximate scale symmetry in walking technicolor.