# Measurement of CP observables in B 0 → DK â̂ - 0 with D →k + K - 0 w

The Lhcb Collaboration

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6 Scopus citations

## Abstract

The decay B 0 → DK *0 and the charge conjugate mode are studied using 1.0 fb-1 of pp collision data collected by the LHCb experiment at √S=7 TeV in 2011. The CP asymmetry between the B 0 → DK *0 and the ̄0 to D̄K*0 decay rates, with the neutral D meson in the CP-even final state K + K -, is found to be AKK d =-0.45±0.23±0.02, where the first uncertainty is statistical and the second is systematic. In addition, favoured B 0 → DK *0 decays are reconstructed with the D meson in the non-CP eigenstate K +π-. The ratio of the B-flavour averaged decay rates in D decays to CP and non-CP eigenstates is measured to be RKKd =1.36+0.37-0.32± 0.07, where the ratio of the branching fractions of D 0 → K -π+ to D 0 → K + K - decays is included as multiplicative factor. The CP asymmetries measured with two control channels, the favoured B 0 → DK *0 decay with D → K +π- and the ̄B0s0 → DK*0 decay with D→K + K -, arealsoreported.

Original language English (US) 67 Journal of High Energy Physics 2013 3 https://doi.org/10.1007/JHEP03(2013)067 Published - Mar 12 2013

## Keywords

• B physics
• CKM angle gamma
• CP violation
• Flavor physics