QED-Induced Rapidity-Gap Events at the Z Peak
Hung Jung Lu, Stanley J. Brodsky, Valery A. Khoze
Abstract
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+2θ distribution in the jet-pair scattering angle, instead of the 2θ distribution of the QCD case.
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