Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-09-22
PoS LAT2005:352,2006
Physics
High Energy Physics
High Energy Physics - Lattice
Talk presented at Lattice 2005 (Weak matrix elements), 6 pages, 1 figure
Scientific paper
We use chiral perturbation theory to investigate twisted and partially twisted boundary conditions which allow access to momenta other than integer multiples of 2pi/L on a lattice with spatial volume L^3. For K -> pi pi 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 N_f=2 non-perturbatively improved Wilson quarks.
Flynn Jonathan
Jüttner Andreas
Sachrajda Christopher
Villadoro Giovanni
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