Lattice Results for Low Moments of Light Meson Distribution Amplitudes
R. Arthur, P.A. Boyle, D. Br\"ommel, M.A. Donnellan, J.M. Flynn, A., J\"uttner, T.D. Rae, C.T.C. Sachrajda
TL;DR
This paper presents lattice QCD calculations of the first two moments of light meson distribution amplitudes, providing precise results and insights into quark-mass dependence and SU(3) flavor breaking effects.
Contribution
It introduces a nonperturbative renormalisation method for lattice operators and computes moments for multiple mesons with high precision.
Findings
Quantified quark-mass dependence of meson distribution amplitudes.
Observed SU(3)-flavour breaking effects.
Achieved precise lattice results for meson moments.
Abstract
As part of the UKQCD and RBC collaborations' N_f=2+1 domain-wall fermion phenomenology programme, we calculate the first two moments of the light-cone distribution amplitudes of the pseudoscalar mesons pion and kaon and the (longitudinally-polarised) vector mesons rho, K-star and phi. We obtain the desired quantities with good precision and are able to discern the expected quark-mass dependence of SU(3)-flavour breaking effects. An important ingredient of the calculation is the nonperturbative renormalisation of lattice operators using the RI'/MOM technique.
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