QED-Induced Rapidity-Gap Events at the Z Peak
Lu, Hung Jung, Brodsky, Stanley J., Khoze, Valery A. · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1993
We study rapidity-gap events in $e^+e^-$ annihilation at the Z boson peak initiated by the emission of a virtual photon. This mechanism is suppressed by the QED coupling constant, but it is enhanced due to a large propagator term from the virtual photon. For typical kinematics, we find a smaller event rate than analogous QCD type gap events. In the small jet-pair invariant mass limit, the QED type events follow a $1+\cos^2θ$ distribution in the jet-pair scattering angle, instead of the $\sin^2θ$ distribution of the QCD case.