Measurement of the CKM angle γ using B± → DK± with D → K0sπ+π, K0sK+K decays

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Ameri, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, N. K. Watson

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)
80 Downloads (Pure)


A binned Dalitz plot analysis of B± → DK± decays, with D → K0Sπ+π and D → K0SK+K, is performed to measure the CP -violating observables x± and y±, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ. The analysis exploits a sample of proton-proton collision data corresponding to 3.0 fb−1 collected by the LHCb experiment. Measurements from CLEO-c of the variation of the strong-interaction phase of the D decay over the Dalitz plot are used as inputs. The values of the parameters are found to be x+ = (−7.7±2.4±1.0±0.4) × 10−2, x = (2.5±2.5±1.0±0.5) × 10−2, y+ = (−2.2±2.5±0.4±1.0) × 10−2, and y = (7.5±2.9± 0.5±1.4) × 10−2. The first, second, and third uncertainties are the statistical, the experimental systematic, and that associated with the precision of the strong-phase parameters. These are the most precise measurements of these observables and correspond to γ = (62+15−14), with a second solution at γ → γ + 180, and rB = 0.080+0.019−0.021, where rB is the ratio between the suppressed and favoured B decay amplitudes.

Original languageEnglish
Article number97
Number of pages31
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 16 Oct 2014


  • B physics
  • CKM angle gamma
  • CP violation
  • Flavor physics
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Measurement of the CKM angle γ using B± → DK± with D → K0sπ+π, K0sK+K decays'. Together they form a unique fingerprint.

Cite this