Model-independent measurement of the CKM angle γ using B0 → DK∗0 decays with D → K S 0 π + π and K S 0 K+K

The LHCb Collaboration

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A binned Dalitz plot analysis of the decays B0 → DK∗0, with D → KS 0π+π and D → KS 0K+K, is performed to measure the observables x± and y±, which are related to the CKM angle γ and the hadronic parameters of the decays. The D decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the D decay model. With a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment, the values of the CP violation parameters are found to be x+ = 0.05 ± 0.35 ± 0.02, x = −0.31 ± 0.20 ± 0.04, y+ = −0.81 ± 0.28 ± 0.06 and y = 0.31 ± 0.21 ± 0.05, where the first uncertainties are statistical and the second systematic. These observables correspond to values γ = (71 ± 20)°, rB0=0.56±0.17 and δB0=(204−20+21)°. The parameters rB0 and δB0 are the magnitude ratio and strong phase difference between the suppressed and favoured B0 decay amplitudes, and have been measured in a region of ±50 MeV/c2 around the K(892)0 mass and with the magnitude of the cosine of the K(892)0 helicity angle larger than 0.4.

Original languageEnglish
Article number131
JournalJournal of High Energy Physics
Issue number6
Publication statusPublished - 21 Jun 2016


  • B physics
  • CKM angle gamma
  • CP violation
  • Flavor physics
  • Hadron-Hadron scattering (experiments)


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