Measurements of Lifetimes and a Limit on the Lifetime Difference in the Neutral D-Meson System

Preprint

11 March 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/9903012

Abstract

Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report the first directly measured constraint on the decay-width difference Delta Gamma for the mass eigenstates of the D0-D0bar system. We obtain our result from lifetime measurements of the decays D0 --> K-pi+ and D0 --> K-K+, under the assumption of CP invariance, which implies that the CP eigenstates and the mass eigenstates are the same. The lifetime of D0 --> K-K+ (the CP-even final state is \tau_KK = 0.410 +/- 0.011 +/- 0.006 ps, and the lifetime of D0 --> K-pi+ (an equal mixture of CP-odd and CP-even final states is tau_Kpi = 0.413 +/- 0.003 +/- 0.004 ps. The decay-width difference is Delta Gamma = 2(Gamma_KK - Gamma_Kpi) = 0.04 +/- 0.14 +/- 0.05 ps^-1. We relate these measurements to measurements of mixing in the neutral D-meson system.

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All Related Versions

Version 1, 1999-03-10, ArXiv
Version 2, 1999-03-11, ArXiv
Published version: Physical Review Letters, 83 (1), 32.

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