Properties of light scalar mesons from lattice QCD
C. McNeile, C. Michael
Abstract
Lattice QCD with Nf=2 flavours of sea quark is used to explore the spectrum and decay of scalar mesons. We are able to determine the b1 - a0 mass difference and this leads to the conclusion that the lightest non-singlet scalar meson (a0) has a mass of 1.01(4) GeV. We determine from the lattice the coupling strength to KK and πη. We compute the leptonic decay constant of the lightest non-singlet scalar meson. We discuss the impact of these lattice results on the interpretation of the a0(980) state. We also discuss K*0 states.
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