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Regular version of the site

Article

First observation of the decay 𝐵0→𝐷0𝐷⎯⎯⎯⎯⎯0𝐾+𝜋−

Arzymatov K., Belavin V., Boldyrev A., Borisyak M., Derkach D., Guschin M., Kazeev N., Maevskiy A., Ratnikov F., Ryzhikov A., Ustyuzhanin A., Filippov S., Popov S.

The first observation of the decay B0→D0¯D0K+π− is reported using proton-proton collision data corresponding to an integrated luminosity of 4.7  fb−1 collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is performed in the full kinematically allowed range of the decay outside of the D*− region. The ratio of the branching fraction relative to that of the control channel B0→D*−D0K+ is measured to be R=(14.2±1.1±1.0)%, where the first uncertainty is statistical and the second is systematic. The absolute branching fraction of B0→D0¯D0K+π− decays is thus determined to be B(B0→D0¯D0K+π−)=(3.50±0.27±0.26±0.30)×10−4, where the third uncertainty is due to the branching fraction of the control channel. This decay mode is expected to provide insights to spectroscopy and the charm-loop contributions in rare semileptonic decays.