I = 0 scalar channel

Mass spectra of the low-lying nonet scalar mesons in the lattice QCD

“…Our collaboration [21][22][23][24] performed a exploratory work on the σ in the full lattice QCD simulation. We remark that the full QCD simulation is necessary to properly describe the σ with the possible contents, i.e., the glueball, terra quarks and so on.…”

“…The relation between the number of Z 2 noise and the achieved accuracy was investigated in Ref. [21]. Gauge configurations were created by HMC in SX5 vector super computer, and most disconnected propagator calculations by Z 2 noise method were mainly performed SR8000 parallel machine.…”

Quenched scalar-meson correlator with domain wall fermions

“…The observed σ resonance 0 ++ with m ≃ 480 MeV and Γ ≃ 320 MeV [1] can be either a manifestation of the ππ scattering or a distinct 0 ++ state. Recent lattice simulations explore whether the lightest singlet 0 ++ state is a qq state, a mixture ofqq and glueball or aq 2 q 2 state [2,3,4,5]. A dynamical simulation ofqq in Ref.…”

“…A dynamical simulation ofqq in Ref. [2] indicates m lat σ ≃ m lat ρ , while Ref. [3] finds m lat σ as low as m lat π indicating possible restoration of chiral symmetry at finite volume.…”

“…Those simulations were using Wilson [2,3,4,5] and Kogut-Susskind [7] fermions. We re-examine the light scalar spectrum using Domain Wall fermions (DWF), which allow us to study lighter quark masses.…”