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$\Dz-\Dzb$ mixing and significant CP violation in the charm system mayindicate the signature of new physics. In this study, we suggest that thecoherent $\DzDzb$ events from the decay of $\Upsilon(1S) \to \Dz \Dzb$ can beused to measure both mixing parameters and CP violation in charm decays. Theneutral $D$ mesons from $\Upsilon(1S)$ decay are strongly boosted, so that itwill offer the possibility to measure the proper-time interval, $\Delta t$,between the fully-reconstructed $\Dz$ and $\Dzb$. Both coherent andtime-dependent information can be used to extract $\Dz-\Dzb$ mixing parameters.The sensitivity of the measurement should be improved at B factories orsuper-B.Comment: 6 pages, 1 figure, this is the last version to appear in Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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D0−D¯0mixing inΥ(1S)