Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays

Abstract : We present a measurement of D0-D0bar mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+ -> D0 pi+, where D0 decays to K-+pi+-, K-K+, or pi-pi+, along with the untagged decays D0 -> K-+pi+- and D0 -> K-K+. The lifetimes of the CP-even, Cabibbo-suppressed modes K-K+ and pi-pi+ are compared to that of the CP-mixed mode K-+pi+- in order to measure yCP and DeltaY. We obtain yCP = [0.72 +- 0.18 (stat) +- 0.12 (syst)]% and DeltaY = [0.09 +- 0.26 (stat) +- 0.06 (syst)]%, where DeltaY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3 sigma significance. This analysis is based on an integrated luminosity of 468 fb-1 collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider.
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Contributor : Sabine Starita <>
Submitted on : Wednesday, September 19, 2012 - 10:25:11 AM
Last modification on : Tuesday, May 14, 2019 - 10:46:56 AM

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Measurement of D0-D0bar Mixing and CP Violation in Two-Body D0 Decays. Physical Review D, American Physical Society, 2013, 87, pp.012004. ⟨10.1103/PhysRevD.87.012004⟩. ⟨in2p3-00733630⟩



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