Recent Results Addressing the KARMEN Timing Anomaly

Abstract

Recent resuls from experiments at Fermilab and the Paul Scherrer Institute have constrained the parameter space available for a hypothetical particle $Q^0$ produced in the decay $\pi^+ \to \mu^+ Q^0$. This decay has been invoked to explain a peculiar feature of an event arrival time distribution observed in the KARMEN neutrino experiment.Comment: 5 pages, 1 figure. Presented at the Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2000), Quebec City, May 200