The decay B0→DK∗0 and the charge conjugate mode are studied using 1.0fb−1 of pp collision data collected by the LHCb experiment at s√=7TeV in 2011. The CP asymmetry between the B0→DK∗0 and the B¯0→DK¯∗0 decay rates, with the neutral D meson in the CP-even final state K+K−, is found to be KKd=−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 KKd=1.36+0.37−0.32±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 B¯0s→DK∗0 decay with D→K+K−, are also reported.
Measurement of CP observables in B 0 → DK ∗0 with D →K + K −
BALDINI, Wander;BOZZI, Concezio;SAVRIE', Mauro;
2013
Abstract
The decay B0→DK∗0 and the charge conjugate mode are studied using 1.0fb−1 of pp collision data collected by the LHCb experiment at s√=7TeV in 2011. The CP asymmetry between the B0→DK∗0 and the B¯0→DK¯∗0 decay rates, with the neutral D meson in the CP-even final state K+K−, is found to be KKd=−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 KKd=1.36+0.37−0.32±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 B¯0s→DK∗0 decay with D→K+K−, are also reported.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.