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

doi:10.1103/PhysRevD.89.111502

Light composite scalar in eight-flavor QCD on the lattice

High Energy Physics - Lattice 2014-06-25 v3 High Energy Physics - Phenomenology

Authors: Yasumichi Aoki , Tatsumi Aoyama , Masafumi Kurachi , Toshihide Maskawa , Kohtaroh Miura , Kei-ichi Nagai , Hiroshi Ohki , Enrico Rinaldi , Akihiro Shibata , Koichi Yamawaki , Takeshi Yamazaki

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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.

Keywords

composite scalar eight-flavor qcd lattice qcd staggered quark action technidilaton walking technicolor flavor-singlet

Cite

@article{arxiv.1403.5000,
  title  = {Light composite scalar in eight-flavor QCD on the lattice},
  author = {Yasumichi Aoki and Tatsumi Aoyama and Masafumi Kurachi and Toshihide Maskawa and Kohtaroh Miura and Kei-ichi Nagai and Hiroshi Ohki and Enrico Rinaldi and Akihiro Shibata and Koichi Yamawaki and Takeshi Yamazaki},
  journal= {arXiv preprint arXiv:1403.5000},
  year   = {2014}
}

Comments

5 pages, 3 figures; presentation improved and systematic errors corrected

Light composite scalar in eight-flavor QCD on the lattice

Abstract

Keywords

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