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First observation of the decay Bˉ0s→D0K∗0 and a measurement of the ratio of branching fractions B(Bˉ0s→D0K∗0)B(Bˉ0→D0ρ0).

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  • The LHCb Collaboration

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Original languageEnglish
JournalPhysics Letters B
Publication statusPublished - 15 Nov 2011


The first observation of the decay Bˉ0s→D0K∗0 using pp data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb−1, is reported. A signal of 34.4±6.8 events is obtained and the absence of signal is rejected with a statistical significance of more than nine standard deviations. The Bˉ0s→D0K∗0 branching fraction is measured relative to that of Bˉ0→D0ρ0: B(Bˉ0s→D0K∗0)B(Bˉ0→D0ρ0)=1.48±0.34±0.15±0.12, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the B0 and B0s hadronisation fractions.

ID: 1632680