Generalized Dirac duality and CP violation in a two photon theory

TL;DR

This paper explores a generalized Dirac duality in a two-photon theory with kinetic mixing, revealing potential new sources of CP violation confined to the hidden sector, which could have implications for understanding symmetry violations.

Contribution

It introduces a generalized duality symmetry in a two-photon framework and analyzes conditions for CP violation, emphasizing the hidden sector as the source.

Findings

Kinetic mixing generalizes Dirac duality symmetry.

CP violation occurs exclusively in the hidden sector.

The theory allows for both CP conserving and violating scenarios.

Abstract

A kinetic mixing term, which generalizes the duality symmetry of Dirac, is studied in a theory with two photons (visible and hidden). This theory can be either CP conserving or CP violating depending on the transformation of fields in the hidden sector. However if CP is violated, it necessarily occurs in the hidden sector. This opens up an interesting possibility of new sources of CP violation.