Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Hadronenstruktur und -spektroskopie
HK 17.7: Talk
Tuesday, March 18, 2014, 15:30–15:45, HZ 1+2
The pion scalar radius from two-flavor Wilson Lattice QCD — •Vera Gülpers — Helmholtz-Institut Mainz, Johann-Joachim-Becherweg 36, 55128 Mainz
We calculate the scalar charge radius of the pion using Nf=2 dynamical flavors of non-perturbatively O(a)-improved Wilson fermions in a wide range of pion masses. We find that the disconnected contribution to the scalar radius is not negligible especially for smaller pion masses, and is required in order to obtain the behavior expected from next-to-leading order (NLO) Chiral Perturbation Theory (χPT). The low energy constant ℓ4 is determined from a fit to NLO χPT.