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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 Nf = 2 + 1 lattice QCDDalibor Djukanovic1,2, Georg von Hippel3, Harvey B. Meyer1,2,3, Konstantin Ottnad3, •Miguel Salg3, Jonas Wilhelm3, and Hartmut Wittig1,2,31Helmholtz 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 Nf = 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.

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