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

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.

12.38.Gc
11.15.Ha
fermion: lattice field theory
gauge field theory: SU(3)
pi: form factor
current: vector
two-point function
pi: mass
rho(770): mass
n-point function: 3

References(34)

Figures(0)

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