Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 60, 112004 (1999). Copyright © 1999 American Physical Society. Permission to use.


The oscillation frequency Δmd of B00 mixing is measured using the partially reconstructed semileptonic decay 0l- ν̅ D*+X. The data sample was collected with the CDF detector at the Fermilab Tevatron collider during 1992–1995 by triggering on the existence of two lepton candidates in an event, and corresponds to about 110 pb-1 of p̅p collisions at √s =1.8 TeV. We estimate the proper decay time of the 0 meson from the measured decay length and reconstructed momentum of the l-D*+ system. The charge of the lepton in the final state identifies the flavor of the 0 meson at its decay. The second lepton in the event is used to infer the flavor of the 0 meson at production. We measure the oscillation frequency to be Δmd=0.516 ±0.099-0.035+0.029ps-1, where the first uncertainty is statistical and the second is systematic.

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