https://doi.org/10.1140/epjc/s10052-007-0295-6
Regular Article - Theoretical Physics
The pion form factor from lattice QCD with two dynamical flavours
1
Theory Group, Deutsches Elektronen-Synchrotron DESY, 22603, Hamburg, Germany
2
Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany
3
Institut für Theoretische Physik T39, Physik-Department der TU München, 85747, Garching, Germany
4
School of Physics, University of Edinburgh, Edinburgh, EH9 3JH, UK
5
John von Neumann-Institut für Computing NIC/DESY, 15738, Zeuthen, Germany
6
Theoretical Physics Division, Dep. of Math. Sciences, University of Liverpool, Liverpool, L69 3BX, UK
7
Konrad-Zuse-Institut für Informationstechnik ZIB, 14195, Berlin, Germany
* e-mail: dirk.broemmel@desy.de
Received:
18
September
2006
Revised:
30
January
2007
Published online:
4
May
2007
We compute the electromagnetic form factor of the pion, using non-perturbatively O(a) improved Wilson fermions. The calculations are done for a wide range of pion masses and lattice spacings. We check for finite size effects by repeating some of the measurements on smaller lattices. The large number of lattice parameters we use allows us to extrapolate to the physical point. For the square of the charge radius we find 
fm2, in good agreement with experiment.
© Springer-Verlag Berlin Heidelberg, 2007
