Speaker
Roger Horsley
(University of Edinburgh)
Description
QCD lattice simulations with 2+1 flavours typically start at
rather large up-down and strange quark masses and extrapolate
first the strange quark mass to its physical value and then
the up-down quark mass. An alternative method of tuning the
quark masses is discussed here in which the singlet quark mass
is kept fixed, which ensures that the kaon always has mass less
than the physical kaon mass. It can also take into account
the different renormalisations (for singlet and non-singlet
quark masses) occurring for non-chirally invariant lattice
fermions and so allows a smooth extrapolation to the physical
quark masses. This procedure enables a wide range of quark masses
to be probed, including the case with a heavy up-down quark mass
and light strange quark mass.
Numerical results show the correct order for the baryon octet
and decuplet spectrum and an extrapolation to the physical
pion mass gives mass values to within a few percent of their
experimental values.
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Primary author
Roger Horsley
(University of Edinburgh)
