Using isospin symmetry the quarkconnected and disconnected contributions to the hadronic vacuum polarisation in a theory with N_f=2 flavours can be described as independent correlation functions, respectively. We show how this allows to use twisted boundary conditions for the connected contribution in order to improve the q^2resolution in lattice QCD. Furthermore we derive an exact relation between the connected and the disconnected contributions at NLO in chiral perturbation theory. We discuss extensions to theories with more than 2 dynamical flavours.
Original language  Undefined/Unknown 

Journal  PoS LAT 

Publication status  Published  20. Oct 2009 

7 pages, 1 figure, 1 table, Talk presented at The XXVII International Symposium on Lattice Field Theory, LATTICE 2009  Peking University, Beijing, China / July 26  31, 2009
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@article{c8259352dcef479fb213776e98cc8abd,
title = "New ideas for g2 on the lattice",
abstract = " Using isospin symmetry the quarkconnected and disconnected contributions to the hadronic vacuum polarisation in a theory with N_f=2 flavours can be described as independent correlation functions, respectively. We show how this allows to use twisted boundary conditions for the connected contribution in order to improve the q^2resolution in lattice QCD. Furthermore we derive an exact relation between the connected and the disconnected contributions at NLO in chiral perturbation theory. We discuss extensions to theories with more than 2 dynamical flavours. ",
keywords = "heplat",
author = "Morte, {Michele Della} and Andreas Juttner",
note = "7 pages, 1 figure, 1 table, Talk presented at The XXVII International Symposium on Lattice Field Theory, LATTICE 2009  Peking University, Beijing, China / July 26  31, 2009",
year = "2009",
month = oct
day = "20",
language = "Udefineret/Ukendt",
journal = "PoS LAT",
}
TY  JOUR
T1  New ideas for g2 on the lattice
AU  Morte, Michele Della
AU  Juttner, Andreas
N1  7 pages, 1 figure, 1 table, Talk presented at The XXVII International Symposium on Lattice Field Theory, LATTICE 2009  Peking University, Beijing, China / July 26  31, 2009
PY  2009/10/20
Y1  2009/10/20
N2  Using isospin symmetry the quarkconnected and disconnected contributions to the hadronic vacuum polarisation in a theory with N_f=2 flavours can be described as independent correlation functions, respectively. We show how this allows to use twisted boundary conditions for the connected contribution in order to improve the q^2resolution in lattice QCD. Furthermore we derive an exact relation between the connected and the disconnected contributions at NLO in chiral perturbation theory. We discuss extensions to theories with more than 2 dynamical flavours.
AB  Using isospin symmetry the quarkconnected and disconnected contributions to the hadronic vacuum polarisation in a theory with N_f=2 flavours can be described as independent correlation functions, respectively. We show how this allows to use twisted boundary conditions for the connected contribution in order to improve the q^2resolution in lattice QCD. Furthermore we derive an exact relation between the connected and the disconnected contributions at NLO in chiral perturbation theory. We discuss extensions to theories with more than 2 dynamical flavours.
KW  heplat
M3  Tidsskriftartikel
JO  PoS LAT
JF  PoS LAT
ER 