Measurement of indirect CP-violating asymmetries in D[superscript 0] → K[superscript +]K[superscript −] and D[superscript 0] → π[superscript +]π[superscript −] decays at CDF
Name
PhysRevD.90.111103.pdf
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Author(s)
Aaltonen, T.
Amerio, S.
Amidei, D.
Anastassov, A.
Annovi, A.
Antos, J.
Apollinari, G.
Appel, J. A.
Arisawa, T.
Artikov, A.
Date Issued
December 2014
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T., et al. "Measurement of indirect CP-violating asymmetries in D[superscript 0] → K[superscript +]K[superscript −] and D[superscript 0] → π[superscript +]π[superscript −] decays at CDF." Phys. Rev. D 90, 111103 (December 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We report a measurement of the indirect CP-violating asymmetries (A[subscript Γ]) between effective lifetimes of anticharm and charm mesons reconstructed in D[superscript 0] → K[superscript +]K[superscript -] and D[superscript 0] → π[superscript +]π[superscript -] decays. We use the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab experiment and corresponding to 9.7 fb[superscript -1] of integrated luminosity. The strong-interaction decay D[superscript *+] → D[superscript 0]π[superscript +] is used to identify the meson at production as D[superscript 0] or [bar over D][superscript 0]. We statistically subtract D[superscript 0] and [bar over D][superscript 0] mesons originating from b-hadron decays and measure the yield asymmetry between anticharm and charm decays as a function of decay time. We measure A[subscript Γ](K[superscript +]K[superscript -]) = (-0.19 ± 0.15(stat) ± 0.04(syst))% and A[subscript Γ](π[superscript +]π[superscript -]) = (-0.01 ± 0.18(stat) ± 0.03(syst))%. The results are consistent with the hypothesis of CP symmetry and their combination yields A[subscript Γ] = (-0.12 ± 0.12)%.
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/PhysRevD.90.111103
