Abstract
The authors consider contributions to parity-violating electron-proton scattering from two-photon exchange, where the electromagnetic interaction of the nucleon has a parity-violating component. Unlike the standard short-ranged weak interaction conveyed by a massive $Z$ boson, the considered mechanism induces novel long-range parity-violating forces. This is relevant for upcoming measurements at electron accelerator facilities at the University of Mainz and Jefferson Laboratory, including the Q-Weak experiment. The results will allow access to the weak charge of the nucleon and thereby, potentially, to physics beyond the Standard Model.
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