Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-09-20
JHEP 1011:154,2010
Physics
High Energy Physics
High Energy Physics - Lattice
19 pages, 4 figures; results unchanged; typos corrected, references added and discussion extended; accepted for publication in
Scientific paper
10.1007/JHEP11(2010)154
We show how quark-disconnected and quark-connected contributions to hadronic n-point functions can be written as independent correlators for which one can derive expressions in partially quenched chiral effective theory. As an example we apply the idea to the case of the hadronic vacuum polarisation. In particular, we consider the cases of the Nf = 2 theory without and with a partially quenched strange quark and also the Nf = 2 + 1 theory. In the latter two cases a parameter-free prediction for the disconnected contribution at NLO in the effective theory is given. Finally we show how twisted boundary conditions can then be used in lattice QCD to improve the q^2 resolution in the connected contributions even when flavour singlet operators are considered.
Jüttner Andreas
Morte Michele Della
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