Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Structure and Dynamics of Nuclei VI
HK 22.2: Group Report
Wednesday, March 18, 2026, 14:15–14:45, AM 00.021
Two-body currents at finite momentum transfer and WIMP-nucleus scattering — •Catharina Brase1,2,3, Zhen Li1,2,3, Yukiya Chiba4, Takayuki Miyagi4, Javier Menéndez5,6, and Achim Schwenk1,2,3 — 1Technische Universität Darmstadt, Department of Physics — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg — 4Center for Computational Sciences, University of Tsukuba — 5Departament de Física Quántica i Astrofísica, Universitat de Barcelona — 6Institut de Ciències del Cosmos, Universitat de Barcelona
We study two-body currents (2BCs) in scattering processes off medium-heavy nuclei. The inclusion of 2BCs at finite momentum transfer is important for various electroweak processes. In this work, we calculate structure factors for spin-dependent WIMP-nucleus scattering, which are needed for dark matter direct detection experiments. The structure factors encode the nuclear response and have to be calculated theoretically. We investigate the effects of 2BCs with full momentum transfer dependence on the structure factors for 19F, 29Si, 129,131Xe. Our results are compared to previous calculations that used approximation schemes to include 2BCs.
Keywords: Two-body currents; Weakly interacting massive particles; Scattering off nucleus; F19, Si29, Xe129,131; Structure factor