A detailed lattice QCD formalism and numerical tests show that G-parity boundary conditions yield moving pions with correct energies and preserved isospin, enabling physical-kinematics kaon decay calculations.
G parity boundary conditions and Delta I = 1/2, K to pi pi decays
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abstract
The use of G-parity boundary conditions to compute Delta I = 1/2, K to pi pi decays is reviewed and a method to consistently treat both the pions and kaon in full QCD proposed. This approach creates a physical, final-state, pion momentum using a 3 fm box and avoids statistical noise coming from pions with smaller momentum.
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Lattice simulations with G-parity Boundary Conditions
A detailed lattice QCD formalism and numerical tests show that G-parity boundary conditions yield moving pions with correct energies and preserved isospin, enabling physical-kinematics kaon decay calculations.