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`QCD flavour-blindness on the lattice and in the real world'

Abstract: The QCD interaction is flavour-blind. Neglecting 
electromagnetic and weak interactions, the only difference between 
flavours is caused by the different quark masses. We explain how 
flavour-blindness constrains hadron masses and matrix elements after 
flavour SU(3) is broken by the mass difference between the strange and 
light quarks. We use this knowledge to help us extrapolate 2+1 flavour 
lattice data to the physical point. Flavour blindness is particularly
useful if we approach the physical point along a path with the sum of the 
quark masses held constant.
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