Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 105: Search for new particles 6

T 105.1: Talk

Friday, March 8, 2024, 09:00–09:15, Geb. 20.30: 1.067

New physics searches with the precision spectroscopy of highly charged ions — •Matteo Moretti, Zoltan Harman, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

High-precision spectroscopy of bound-electron systems enables searches for new physics. The comparison of precisely measured observables such as transition energies or g factors with sufficiently accurate quantum electrodynamic (QED) calculations allows in principle the isolation of effects due to physics beyond the Standard Model. Recently, such a procedure was applied to set a bound on the coupling constant of a massive scalar boson exchanged between an electron and a nucleon [1,2]. Here we develop a one-particle exchange interaction among two bound electrons in a highly charged ion. The simplest way to treat this interaction is through the involvement of a massive scalar particle among electrons in the 1s–2s states. The correction due to this effect to g factor is evaluated for three-electron ions, i.e. for the simplest electronic systems possessing net electron spin. For such ions, both QED theory and experiment are on a high level of sophistication, therefore, we anticipate competitive bounds for the coupling constant. Further studies are being performed for pseudo-scalar, vector and axial-vector exchange bosons. – [1] V. Debierre, C. H. Keitel, Z. Harman, Phys. Lett. B 807, 135527 (2020); [2] T. Sailer, V. Debierre, Z.  Harman, et al., Nature 606, 479 (2022).

Keywords: Beyond the Standard Model BSM; Quantum Electrodynamics QED; Highly Charged Ions HCI; g factor