Pion and Kaon Distribution Amplitudes from lattice QCD: towards the continuum limit

Understand

We present the current status of a non-perturbative lattice calculation of the moments of the pion and kaon distribution amplitudes by the RQCD collaboration.

• Our investigation is carried out using $N_f=2+1$ dynamical, non-perturbatively O(a)-improved Wilson fermions on the CLS ensembles with 5 different lattice spacings and pion masses down to the physical pion mass.
• A combined continuum and chiral extrapolation to the physical point is performed along two independent quark mass trajectories simultaneously.
• We employ momentum smearing in order to decrease the contamination by excited states and increase statistical precision.