Phys. Rev. Lett. 84, 5038 - 5042 (2000)

Search for D⁰-D̅ ⁰ Mixing

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R. Godang et al. (CLEO Collaboration)
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Received 3 January 2000

We have studied the “wrong-sign” process D⁰→K⁺π^- to search for D⁰-D̅ ⁰ mixing. The data come from 9.0 fb^-1 of e⁺e^- collisions at sqrt[s]≈10 GeV recorded with the CLEO II.V detector. We measure the relative rate of the wrong-sign process D⁰→K⁺π^- to the Cabibbo-favored process D̅ ⁰→K⁺π^- to be R = (0.332_-0.065^+0.063±0.040)%. We study D⁰→K⁺π^- as a function of decay time to distinguish direct doubly Cabibbo-suppressed decay from D⁰-D̅ ⁰ mixing. The amplitudes that describe D⁰-D̅ ⁰ mixing, x^′ and y^′, are consistent with zero. At the 95% C.L. and without assumptions concerning charge-parity ( CP) violating parameters, we find (1/2)x^′2<0.041% and -5.8%<y^′<1.0%.

URL: http://link.aps.org/abstract/PRL/v84/p5038
DOI: 10.1103/PhysRevLett.84.5038
PACS: 13.25.Ft, 12.15.Mm, 14.40.Lb

^* Permanent address: University of Cincinnati, Cincinnati, OH 45221.
^† Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
^‡ Permanent address: University of Texas–Pan American, Edinburg, TX 78539.
^§ Permanent address: Yonsei University, Seoul 120-749, Korea.

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Phys. Rev. Lett. 84, 5038 - 5042 (2000)

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