Model independent determination of the CKM phase γ using input from D0−D¯0 mixing

Sam T Harnew, Jonas H Rademacker

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

19 Citations (Scopus)
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We present a new, amplitude model-independent method to measure the CP violation parameter γ in B−→DK− and related decays. Information on charm interference parameters, usually obtained from charm threshold data, is obtained from charm mixing. By splitting the phase space of the D meson decay into several bins, enough information can be gained to measure γ without input from the charm threshold. We demonstrate the feasibility of this approach with a simulation study of B−→DK−with D→K+π−π+π−. We compare the performance of our novel approach to that of a previously proposed binned analysis which uses charm interference parameters obtained from threshold data. While both methods provide useful constraints, the combination of the two by far outperforms either of them applied on their own. Such an analysis would provide a highly competitive measurement of γ. Our simulation studies indicate, subject to assumptions about data yields and the amplitude structure of D0→K+π−π+π−, a statistical uncertainty on γ of ∼13∘ with existing data and 4∘ for the LHCb-upgrade.
Original languageEnglish
Article number169
Number of pages23
JournalJournal of High Energy Physics
Early online date31 Mar 2015
Publication statusPublished - Mar 2015

Bibliographical note

Date of Acceptance: 20/02/2015


  • CP violation
  • gamma
  • charm
  • charm mixing
  • amplitude-model independent measurement


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