VIII International Conference "Models in Quantum Field Theory"

Form of axion in DFSZ models with $U(1)_{PQ}$ symmetry

Oct 10, 2025, 2:30 PM

30m

Room 2, 2nd floor

Session talk Section A: Mathematical methods in QFT Section A: Mathematical methods in QFT

Speaker

Binh Vu (Bogoliubov Laboratory of Theoretical Physics, JINR)

Description

Form of axion state in the DFSZ-I and DFSZ-II models are re-examined by diagonalizing the mass mixing matrix of $CP$-odd sector as well as applying $PQ$ mechanism to determine $PQ$ charges of particles that are used in general form of axion. In these models, $PQ$ charge of the singlet scalar is the only one parameter for $U(1)_{PQ}$ symmetry. Anomaly couplings of axion and axion-photon-photon couplings are studied in comparison with other Beyond Standard Models which also contain axion arise from $U(1)_{PQ}$ symmetry breaking. The contribution from scalar sector to the process $a \to \gamma \gamma$ is studied and shows significant values for axion searching experiments.

Presentation materials

MQFT2025.pdf