Light composite scalar in eight-flavor QCD on the lattice

2014/03/31 by Yasumichi Aoki, Tatsumi Aoyama, Masafumi Kurachi +8 · 1 citation
Physics and Astronomy · #hep-lat #hep-ph

paper · pdf · doi:10.1103/physrevd.89.111502

published as Phys. Rev. D 89, 111502 (2014) · 5 pages, 3 figures; presentation improved and systematic errors corrected

arxiv created 2014/05/14 · arxiv updated 2014/06/25

Abstract

We present the first observation of a flavor-singlet scalar meson as light as the pion in N_f=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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