Pion electromagnetic form factor from full lattice QCD

Understand

We present preliminary results from the first calculation of the pion electromagnetic form factor at physical light quark masses.

• This form factor parameterises the deviations from the behaviour of a point-like particle when a photon hits the pion.
• These deviations result from the internal structure of the pion and can thus be calculated in QCD.
• We use three sets (different lattice spacings) of n_f=2+1+1 lattice configurations generated by the MILC collaboration.