Observation of D[superscript 0]-[line over D][superscript 0] Mixing Using the CDF II Detector
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Aaltonen-2013-Observation of D.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Date Issued
December 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Observation of D[superscript 0]-[line over D][superscript 0] Mixing Using the CDF II Detector.” Physical Review Letters 111, no. 23 (December 2013). © 2013 American Physical Society
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Final published version
Abstract
We measure the time dependence of the ratio of decay rates for D[superscript 0] → K[superscript +]π[superscript −] to the Cabibbo-favored decay D[superscript 0] → K[superscript −]π[superscript +]. The charge conjugate decays are included. A signal of 3.3 × 10[superscript 4] D[superscript *+] → π[superscript +]D[superscript 0], D[superscript 0] → K[superscript +]π[superscript −] decays is obtained with D[superscript 0] proper decay times between 0.75 and 10 mean D[superscript 0] lifetimes. The data were recorded with the CDF II detector at the Fermilab Tevatron and correspond to an integrated luminosity of 9.6 fb[superscript −1] for p[line over p] collisions at s√ = 1.96 TeV. Assuming CP conservation, we search for D[superscript 0]-[line over D[superscript 0] mixing and measure the mixing parameters to be R[subscript D] = (3.51 ± 0.35) × 10[superscript −3], y[superscript ′] = (4.3 ± 4.3) × 10[superscript −3], and x[superscript '2] = (0.08 ± 0.18) × 10[superscript −3]. We report Bayesian probability intervals in the x[superscript '2]-y[superscript ′] plane and find that the significance of excluding the no-mixing hypothesis is equivalent to 6.1 Gaussian standard deviations, providing the second observation of D[superscript 0]-[line over D[superscript 0] mixing from a single experiment.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.231802
