Testing helicity-dependent<i>γγ</i>→<i>γγ</i>scattering in the region of MeV
Testing helicity-dependent<i>γγ</i>→<i>γγ</i>scattering in the region of MeV
Light-by-light scatterings contain rich information on the photon coupling to virtual and real particle states. In the context of quantum electrodynamics (QED), photons can couple to a virtual $e^+e^-$ pair. Photons may also couple to known resonance states in the context of quantum chromodyanmics and electroweak dynamics in higher energy …