Limits on Neutral D Mixing in Semileptonic Decays

TL;DR

This paper reports a search for neutral D meson mixing in semileptonic decays using CLEO II.V data, setting an upper limit on the mixing rate at 0.78% with 90% confidence.

Contribution

First to set an experimental upper limit on D0 mixing in semileptonic decays using CLEO data.

Findings

Mixing rate less than 0.78% at 90% confidence level.

No evidence of D0 mixing observed in semileptonic decays.

Provides constraints for theoretical models of charm mixing.

Abstract

Using the CLEO II.V detector observing e+e- collisions at around 10.6 GeV we search for neutral D mixing in semileptonic D0 decays tagged in charged D* decays. Combining the results from the Kenu and K*enu channels we find that the rate for D mixing is less than 0.0078 at 90% C.L.