2013/05/31 by Yasumichi Aoki, Tatsumi Aoyama, Masafumi Kurachi +7 · 1 citation
Physics and Astronomy · #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevlett.111.162001
published as Phys. Rev. Lett 111, 162001 (2013) · 5 pages, 4 figures, 1 table. This version contains minor modifications and an updated Table 1. Accepted for publication in Physical Review Letters
arxiv created 2013/09/26 · arxiv updated 2013/10/21
Based on lattice simulations using highly improved staggered quarks for twelve-flavor QCD with several bare fermion masses, we observe a flavor-singlet scalar state lighter than the pion in the correlators of fermionic interpolating operators. The same state is also investigated using correlators of gluonic interpolating operators. Combined with our previous study, that showed twelve-flavor QCD to be consistent with being in the conformal window, we infer that the lightness of the scalar state is due to infrared conformality. This result shed some light on the possibility of a light composite Higgs boson ("technidilaton") in walking technicolor theories.