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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Structure and Dynamics of Nuclei XII
HK 65.4: Talk
Thursday, March 14, 2024, 16:45–17:00, HBR 19: C 5a
Two-body currents at finite momentum transfer — •Catharina Brase1,2,3, Takayuki Miyagi1,2,3, Javier Menéndez4,5, 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 — 4Departament de Física Quántica i Astrofísica, Universitat de Barcelona, 08028 Barcelona, Spain — 5Institut de Ciències del Cosmos, Universitat de Barcelona, 08028 Barcelona, Spain
Two-body currents (2BCs) at zero momentum transfer are essential for understanding observables of electroweak interactions with nuclei, such as helping to solve the long-standing quenching problem. For other processes, e.g., weakly-interacting massive particles scattering off nuclei, 2BCs need to be evaluated at finite momentum transfer and are currently only approximately included. We derived a multipole decomposition of 2BCs to include 2BCs at finite momentum transfer in calculations for processes with medium-mass nuclei, without approximating the 2BCs. To validate the derived multipole decomposition of the 2BCs we compare matrix elements of 2BCs from chiral effective field theory in a harmonic oscillator basis evaluated with the multipole decomposition and with brute force, i.e., Monte Carlo integration to numerically evaluate the diagrams.
* Funded by the ERC Grant Agreement No. 101020842.
Keywords: Two-body currents; Chiral EFT