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Induced CP-violation in the Euler–Heisenberg Lagrangianстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Ghasemkhani M., Rahmanpour V., Bufalo R., Mnatsakanova M.N., Soto A.
- Журнал: European Physical Journal C
- Том: 83
- Год издания: 2023
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Номер статьи: 39
- DOI: 10.1140/epjc/s10052-022-11145-8
- Аннотация: In this paper, we examine the behaviour of theEuler–Heisenberg effective action in the presence of a novel axial coupling among the gauge field and the fermionic matter. This axial coupling is responsible to induce a CP-violating term in the extended form of the Euler–Heisenberg effective action, which is generated naturally through theanalysis of the box diagram. However, this anomalous model is not a viable extension of QED, and we explicitly show that the induced CP-violating term in the Euler–Heisenberg effective Lagrangian is obtained only by adding an axial coupling to the ordinary QED Lagrangian. In order to perform our analysis, we use a parametrization of the vector and axial coupling constants, g_v and g_a, in terms of a new coupling β. Interestingly, this parametrization allows us to explore a hidden symmetry under the change of g_v ↔ g_a in some diagrams. This symmetry is explicitly observed in the analysis of the box diagram, where we determine the λ_i coefficientsof L^EH_ext. = λ_1F^2+λ_2G^2+λ_3FG, specially the coefficient λ_3 related with the CP-violating term due to the axial coupling. As a phenomenological application of the results, we compute the relevant cross section for the light by light scattering through the extended Euler–Heisenberg effective action.
- Добавил в систему: Мнацаканова Мелита Николаевна