# Measurement of CP observables in B0 -> D K*0 with D -> K+ K-

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Measurement of CP observables in B0 -> D K*0 with D -> K+ K-. Journal of High Energy Physics, 2013:67.

## 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→DK¯¯¯∗0 decay rates, with the neutral D meson in the CP-even final state K + K −, is found to be AKKd=−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 B¯¯0s→DK∗0 decay with D→K + K −, arealsoreported.

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→DK¯¯¯∗0 decay rates, with the neutral D meson in the CP-even final state K + K −, is found to be AKKd=−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 B¯¯0s→DK∗0 decay with D→K + K −, arealsoreported.

## Citations

5 citations in Web of Science®
7 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2013 20 Feb 2014 10:21 05 Apr 2016 17:37 Springer 1029-8479 Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP03(2013)067
Permanent URL: https://doi.org/10.5167/uzh-92014