First determination of the CP content of D→π+π-π+π- and updated determination of the CP contents of D→π+π-π0 and D→ K+K-π0

S. Malde, C. Thomas, G. Wilkinson*, P. Naik, C. Prouve, J. Rademacker, J. Libby, M. Nayak, T. Gershon, R. A. Briere

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

33 Citations (Scopus)


Quantum-correlated ψ(3770)→DD decays collected by the CLEO-c experiment are used to perform a first measurement of F+, the fractional CP-even content of the self-conjugate decay D→π+π-π+π-, obtaining a value of 0.737±0.028. An important input to the measurement comes from the use of D→KS0π+π- and D→KL0π+π- decays to tag the signal mode. This same technique is applied to the channels D→π+π-π0 and D→K+K-π0, yielding F+πππ0=1.014±0.045±0.022 and F+KKπ0=0.734±0.106±0.054, where the first uncertainty is statistical and the second systematic. These measurements are consistent with those of an earlier analysis, based on CP-eigenstate tags, and can be combined to give values of F+πππ0=0.973±0.017 and F+KKπ0=0.732±0.055. The results will enable the three modes to be included in a model-independent manner in measurements of the unitarity triangle angle γ using B→DK decays, and in time-dependent studies of CP violation and mixing in the D0D0 system.

Original languageEnglish
Pages (from-to)9-17
Number of pages9
JournalPhysics Letters B
Publication statusPublished - 1 Jul 2015


  • Charm decay
  • CP violation
  • Quantum correlations


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