Measurement of the branching fractions of the decays D+→KK+K+, D+→ππ+K+ and Ds+→πK+K+

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  • LHCb Collaboration

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  • Institution Nikhef National Institute for Subatomic Physics
  • Universität Zürich
  • Universidad de Santiago de Compostela
  • University of Michigan, Ann Arbor.
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  • University of Cincinnati
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  • University of Manchester
  • Ruprecht-Karls-Universität Heidelberg
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  • Institute for High Energy Physics (IHEP)
  • Syracuse University, Syracuse, New York 13244, USA
  • Yandex School of Data Analysis
  • INFN Sezione di Cagliari
  • Institute of Physics


The branching fractions of the doubly Cabibbo-suppressed decays D+→KK+K+, D+→ππ+K+ and Ds+→π K+K+ are measured using the decays D+→Kπ+π+ and Ds+→K K+π+ as normalisation channels. The measurements are performed using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2.0 fb−1 . The results are

ℬ(D+→KK+K+)/ℬ(D+→Kπ+π+) = (6.541±0.025±0.042)×10−4,
ℬ(D+→ππ+K+)/ℬ(D+→Kπ+π+) = (5.231±0.009±0.023)×10−3,
ℬ(Ds+→πK+K+)/ℬ(Ds+→KK+π+) = (2.372±0.024±0.025)×10−3

where the uncertainties are statistical and systematic, respectively. These are the most precise measurements up to date.


Original languageEnglish
Article number176
Number of pages24
JournalJournal of High Energy Physics
Issue number3
Publication statusPublished - 27 Mar 2019


  • Branching fraction, Charm physics, Flavor physics, Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas