Pion structure from improved lattice QCD: form factor and charge radius at low masses

Details Pion structure from improved lattice QCD: form factor and charge radius at low masses Pion structure from improved lattice QCD: form factor and charge radius at low masses

2003-12-15

arxiv.org/abs/hep-lat/0312023v2

Phys.Rev. D69 (2004) 094511

Physics

High Energy Physics

High Energy Physics - Lattice

12 pages REVTeX, 15 figures. Designation of currents clarified. Details concerning extraction of parameters added. Version acc

Scientific paper

10.1103/PhysRevD.69.094511

The charge form factor of the pion is calculated in lattice QCD. The non-perturbatively improved Sheikholeslami-Wohlert action is used together with the $\mathcal{O}(a)$ improved vector current. Other choices for the current are examined. The form factor is extracted for pion masses from 970 MeV down to 360 MeV and for momentum transfers $Q^2 \leq 2 \mathrm{GeV}^2$. The mean square charge radius is extracted, compared to previous determinations and its extrapolation to lower masses discussed.

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