出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要:We use chiral perturbation theory to investigate twisted and partially twisted boundary conditions
which allow access to momenta other than integer multiples of 2p/L on a lattice with spatial volume
L3. For K→pp decays we show that the breaking of isospin symmetry by the twisted boundary
conditions implies that the amplitudes cannot be determined in general. We find numerical
evidence for the result that the finite volume effects of the boundary conditions are exponentially
suppressed for quantities without final state interactions (meson masses and meson-to-vacuum
matrix elements) in a simulation with partial twisting on a sea of Nf = 2 non-perturbatively improved
Wilson quarks.