We present the first observation of a flavor-singlet scalar meson as light as the pion in Nf=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.
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Aoki et al. (2014) studied this question.