Measurement of CP observables in $B^0 \to D K^*0$ with $D \to K^+ K^-$
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The decay B0 → 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 B0 → DK*0 and the B0 → DK*0 decay rates, with the neutral D meson in the CP-even final state K+K−‚ is found to be A<inf>d</inf>KK = −0.45 ± 0.23 ± 0.02, where the first uncertainty is statistical and the second is systematic. In addition, favoured B0 → 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 R<inf>d</inf>KK = 1.36 +0.37<inf>−0.32</inf> ± 0.07, where the ratio of the branching fractions of D0 → K−π+ to D0 → K+K− decays is included as multiplicative factor. The CP asymmetries measured with two control channels, the favoured B0 → DK*0 decay with D → K+π− and the B0<inf>s</inf> → DK*0 decay with D → K+K−, are also reported.
Aaij, R., van den Brand, J. F. J., Dettori, F., Ketel, T. J., Koopman, R., Lambert, R. W., ... LHCb, C. (2013). Measurement of CP observables in $B^0 \to D K^*0$ with $D \to K^+ K^-$. Journal of High Energy Physics, 2013(3). https://doi.org/10.1007/JHEP03(2013)067