Measurement Of Partial Widths And Search For Direct Cp Violation In D0 Meson Decays To K K And Pi Pi

Measurement of Partial Widths and Search for Direct CP Violation in D0 Meson Decays to K- K+ and Pi- Pi

The authors present a measurement of relative partial widths and decay rate CP asymmetries in K−K and?−?+ decays of D° mesons produced in p{bar p} collisions at √s = 1.96 TeV. They use a sample of 2 x 105 D*+ → D°?+ (and charge conjugate) decays with the D° decaying to K−?+, K−K+, and?−?+, corresponding to 123 pb−1 of data collected by the CDF II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed, they measure?(D° → K−K+)/?(D° → K−?+) = 0.0992 ± 0.0011 ± 0.0012,?(D° →?−?+)/?(D° → K−?+) = 0.03594 ± 0.00054 ± 0.00040,?(D° → K−K+)/?(D° →?−?+) = 2.760 ± 0.040 ± 0.034, A{sub CP} (K−K+) = (2.0 ± 1.2 ± 0.6)%, and A{sub CP}(?−?+) = (1.0 ± 1.3 ± 0.6)%, where, in all cases, the first uncertainty is statistical and the second is systematic.

High Energy Physics Index

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