1999/09/14 by Harry N. Nelson, Nelson, Harry N.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ex/9909028
Invited plenary talk presented at Kaon '99, The Chicago Conference on Kaon Physics, June 21-26, 1999 at The University of Chicago Further information on the research described here: http://hep.ucsb.edu/people/hnn/wrongd
arxiv created 1999/09/14 · openalex publication_date 1999/09/14 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on a search for D0-D0bar mixing made by a study of the `wrong-sign' process D0 -> K+pi-. The data come from an integrated luminosity of e+e- collisions at sqrts of about 10 GeV consisting of 9.0 1/fb recorded with the CLEO-II.V detector. We measure the time-integrated rate of the `wrong-sign' process D0 -> K+pi-, relative to that of the Cabibbo-favored process D0bar -> K+pi-, to be Rws=(0.34+-0.07+-0.06)%. We study that rate as a function of the decay time of the D0, to distinguish the rate of direct doubly-Cabibbo-suppressed decay from D0-D0bar mixing. The amplitudes that describe D0-D0bar mixing, x' and y', are consistent with zero. The one-dimensional limits, at the 95% C.L., that we determine are (1/2)x'2<0.05%, and -5.9% < y' < 0.3%. All results are preliminary.