Properties of light scalar mesons from lattice QCD
Abstract
Lattice QCD with
N
f
=2
flavours of sea quark is used to explore the spectrum and decay of scalar mesons. We are able to determine the
b
1
-
a
0
mass difference and this leads to the conclusion that the lightest non-singlet scalar meson (
a
0
) 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
a
0
(980)
state. We also discuss
K
∗
0
states.