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Study of $D^{0}-\overline{D}^{0}$ mixing and $D^{0}$ doubly-Cabibbo-suppressed decays (1998)

Abstract

Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D^{*+} --> D^0 pi_{s}^+, with D^0 decaying to K^- pi^+ or to K^+ pi^-, are studied. The relative br anching ratio $B(\D^0 \to \K^+ \pi^-) / B(\D^0 \to \K^- \pi^+)$ is measured to be ( 1.84 \pm 0.59(\stat) \pm 0.34(\syst). The two possible contributions to the $\decDW$ decay, doubly Cabibbo-suppr essed decays and D^0-$D^0bar mixing, are disentangled by measuring the proper-time distribution of the reconstructed D^0's. Assuming no interference between the two processes, the upper limit obtai ned on the mixing rate is 0.92% at 95 % CL. The possible effect of interference between the two amplitudes is also assessed.

Publication details

Download	http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ep-98-118 http://cdsweb.cern.ch/record/361255/files/ep-98-118.pdf http://cdsweb.cern.ch/record/361255/files/ep-98-118.ps.gz
Repository	CERN Document Server (Switzerland)
Keywords	Particle Physics - Experimental Results
Language	eng