# Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays

Abstract : We report a direct measurement of $D^0-overline{D}^0$ mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of $D^0 \rightarrow K_S^0 \pi^+ \pi^-$ and, for the first time, $D^0 \rightarrow K_S^0 K^+ K^-$ decays. The low-momentum pion $\pi_s^+$ in the decay $D^{*+} \rightarrow D^0 \pi_s^+$ identifies the flavor of the neutral $D$ meson at its production. Using 468.5 fb$^{-1}$ of $e^+e^-$ colliding-beam data recorded near $\sqrt s = 10.6$~GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters $x= [1.6 \pm 2.3 ({\rm stat.}) \pm 1.2 ({\rm syst.}) \pm 0.8 ({\rm model}) ] \times10^{-3}$, and $y= [5.7 \pm 2.0 ({\rm stat.}) \pm 1.3 ({\rm syst.}) \pm 0.7 ({\rm model}) ]\times 10^{-3}$. These results disfavor the no-mixing hypothesis with a significance of 1.9 standard deviations, and provide the best measurement to date of $x$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00477542
Contributor : Swarna Bassava <>
Submitted on : Thursday, April 29, 2010 - 2:49:44 PM
Last modification on : Tuesday, December 22, 2020 - 12:40:02 PM

### Citation

P. del Amo Sanchez, J. P. Lees, V. Poireau, E. Prencipe, V. Tisserand, et al.. Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays. Physical Review Letters, American Physical Society, 2010, 105, pp.081803. ⟨10.1103/PhysRevLett.105.081803⟩. ⟨in2p3-00477542⟩

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