Search for Long-Lived Parents of the Z0 Boson

Abstract
We present the results of a search for new particles with long lifetime that decay to a Z0 boson. A long-lived parent of the Z0 is predicted by several models in addition to being an experimentally clean channel. We vertex dimuons with invariant mass near the Z0 peak and study the decay length distribution. No evidence of a long-lived component is found, and cross-section limits are presented on a fourth generation quark model.
All Related Versions