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Calculation of the pion electromagnetic form factor from lattice QCD · Around

2011

Calculation of the pion electromagnetic form factor from lattice QCD

Brandt, Bastian B., Juttner, Andreas, Wittig, Hartmut

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We present a lattice calculation of the vector form factor of the pion for two flavours of non-perturbatively O(a) improved Wilson fermions.

For the measurements we utilise the CLS ensembles which include various lattice spacings and pion masses down to about 250 MeV.
To obtain a fine momentum resolution near zero momentum transfer (q^2) partially twisted boundary conditions are employed using several twist angles.
Due to the fine resolution around q^2=0 we are able to determine the slope of the form factor and, in turn, extract the charge radius of the pion without any model dependence.

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