Speaker
Dr
Roger Horsley
(University of Edinburgh)
Description
SU2 isospin breaking effects in hadron octet and decuplets
are due to a combination of up and down quark mass differences
and electromagnetic effects. Usually these masses difference are small.
Between the Sigma and Lambda the splitting is much larger
due to mixing between these states. We determine the QCD mixing matrix
and hence find the mixing angle and mass splitting. Provided
the average quark mass is kept constant, the expansion coefficients
in our procedure can be determined from computationally cheaper
simulations with mass degenerate sea quarks and partially quenched
valence quarks.
Primary author
Dr
Roger Horsley
(University of Edinburgh)
