Speaker
Description
Axions arise in the context of solving the strong CP - problem in the Peccei-Quinn (PQ) theory, where an additional global U(1) symmetry is introduced in the SM QCD Lagrangian and is spontaneously broken, leading to the appearance of a pseudoscalar pseudo-Nambu-Goldstone boson known as the axion. The dark matter problem is another important challenge in modern physics, and its composition remains uncertain. Axions stand out among several potential candidates for cold dark matter. The role of the axion in solving the strong CP problem and its connection to dark matter make it an interesting object of study.
This study examines the contribution of axion interaction to the energy transitions of lithium-like ions. Precision atomic spectroscopy methods have proven exceptionally effective for testing the Standard Model and detecting deviations from its various modifications. Axion exchange can cause shifts in energy levels in the compounds under consideration. This study involves measuring these energy shifts. The data obtained will help establish constraints on the axion interaction constant.
In our work, a universal expression for the axion reduced matrix element has been obtained. This matrix element is similar to the Breit part of the photon matrix element, which leads to the investigation of systems where the Breit contribution is prominently expressed. Such systems typically involve heavy charged ions, meaning that the probability of detecting axion contributions is high. The plan for future research includes searching for specific systems in which the Breit contribution is well-expressed.
