Light composite scalar in twelve-flavor QCD on the lattice

Abstract

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.

5 pages, 4 figures, 1 table. This version contains minor modifications and an updated Table 1. Accepted for publication in Physical Review Letters

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Highly Improved Staggered Quarks on the Lattice, with Applications to Charm Physics
• The Status of Glueballs
• Towards the glueball spectrum from unquenched lattice QCD
• Direct determination of the strange and light quark condensates from full lattice QCD
• Glueball masses in the large N limit
• A lattice study of the masses of singlet 0++ mesons
• Scalar Meson Spectroscopy with Lattice Staggered Fermions
• Scaling relations for the entire spectrum in mass-deformed conformal gauge theories
• Methods for Pseudoscalar Flavour-Singlet Mesons with Staggered Fermions

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