# name
Measurement of CP observables in B 0 → DK ∗0 with D →K + K −

# metadata.dc.description.abstract[].value
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√=7s=7  TeV in 2011. The CP asymmetry between the B 0 → DK *0 and the  B⎯⎯⎯⎯0→DK⎯⎯⎯⎯∗0B¯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,
AdKK=−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
KKd=1.36+0.37−0.32±0.07,
RdKK=1.36−0.32+0.37±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  B⎯⎯⎯⎯0s→DK∗0B¯s0→DK∗0  decay with D→K + K −, arealsoreported.

# metadata.dc.relation.ispartof[].value
Journal of High Energy Physics, 2013, vol. 3, num. 67

# metadata.dc.rights[].value
cc-by (c) LHCb Collaboration et al., 2013

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Measurement of CP observables in B 0 → DK ∗0 with D →K + K −