Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-06-14
Phys.Lett.B632:313-318,2006
Physics
High Energy Physics
High Energy Physics - Lattice
10 pages, 3 figures
Scientific paper
10.1016/j.physletb.2005.10.042
We investigate the use of partially twisted boundary conditions in a lattice simulation with two degenerate flavours of improved Wilson sea quarks. The use of twisted boundary conditions on a cubic volume (L^3) gives access to components of hadronic momenta other than integer multiples of 2*pi/L. Partial twisting avoids the need for new gluon configurations for every choice of momentum, while, as recently demonstrated, keeping the finite-volume errors exponentially small for the physical quantities investigated in this letter. In this study we focus on the spectrum of pseudo scalar and vector mesons, on their leptonic decay constants and on Z_P, the matrix element of the pseudo scalar density between the pseudo scalar meson and the vacuum. The results confirm the momentum shift imposed by these boundary conditions and in addition demonstrate that they do not introduce any appreciable noise. We therefore advocate the use of partially twisted boundary conditions in applications where good momentum resolution is necessary.
Flynn Jonathan M.
Jüttner Andreas
Sachrajda Chris T.
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