arXiv:1403.5000·v3·High Energy Physics — Lattice
Light composite scalar in eight-flavor QCD on the lattice
Yasumichi Aoki🇯🇵 · Tatsumi Aoyama🇯🇵 · Masafumi Kurachi🇯🇵 · Toshihide Maskawa🇯🇵 · Kohtaroh Miura🇯🇵 · Kei-ichi Nagai🇯🇵 · Hiroshi Ohki🇯🇵 · Enrico Rinaldi🇺🇸 · Akihiro Shibata🇯🇵 · Koichi Yamawaki🇯🇵 · Takeshi Yamazaki (the LatKMI Collaboration)🇯🇵
Abstract
We present the first observation of a flavor-singlet scalar meson as light as the pion in 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.
Comments: 5 pages, 3 figures; presentation improved and systematic errors corrected