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Unphysical Operators in Partially Quenched QCD
Stephen R. Sharpe, Ruth S. Van de Water
We point out that the chiral Lagrangian describing pseudo-Goldstone bosons in partially quenched QCD has one more four-derivative operator than that for unquenched QCD with three f…
Improved bilinears in unquenched lattice QCD
Tanmoy Bhattacharya, Rajan Gupta, Weonjong Lee +2
We summarize the extent to which one can use Ward identities to non-perturbatively improve flavor singlet and non-singlet bilinears with three flavors of non-degenerate dynamical W…
Mass dependence of the hairpin vertex in quenched QCD
Stephen R. Sharpe
The pseudoscalar ``hairpin'' vertex (i.e. quark-disconnected vertex) plays a key role in quenched chiral perturbation theory. Direct calculations using lattice simulations find tha…
Perturbative matching of staggered four-fermion operators with hypercubic fat links
Weonjong Lee, Stephen Sharpe
We calculate the one-loop matching coefficients between continuum and lattice four-fermion operators for lattice operators constructed using staggered fermions and improved by the…