SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy V

HK 24.2: Talk

Thursday, September 2, 2021, 17:00–17:15, H3

Isoscalar electromagnetic form factors of the nucleon in N_f = 2 + 1 lattice QCD — Dalibor Djukanovic^1,2, Georg von Hippel³, Harvey B. Meyer^1,2,3, Konstantin Ottnad³, •Miguel Salg³, Jonas Wilhelm³, and Hartmut Wittig^1,2,3 — ¹Helmholtz Institute Mainz, Staudingerweg 18, D-55128 Mainz, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — ³PRISMA⁺ Cluster of Excellence and Institute for Nuclear Physics, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55128 Mainz, Germany

We present results for the isoscalar electromagnetic form factors of the nucleon computed on the CLS ensembles with N_f = 2 + 1 flavors of O(a)-improved Wilson fermions and an O(a)-improved conserved vector current. In order to estimate the excited-state contamination, we investigate several source-sink separations and apply the summation method. For the computation of the quark-disconnected diagrams, a stochastic estimation using the one-end trick is employed. By these means, we obtain a clear signal for the form factors including the quark-disconnected contributions, which have a distinguishable effect on our data.