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 B ̄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 -, are also reported. © 2013 CERN.
Aaij, R., Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2013). Measurement of CP observables in B0 → DK*0 with D → K+K-. JOURNAL OF HIGH ENERGY PHYSICS, 2013(3) [10.1007/JHEP03(2013)067].
Measurement of CP observables in B0 → DK*0 with D → K+K-
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2013
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 B ̄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 -, are also reported. © 2013 CERN.
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