First observation of the decay B0 →d0 D ˉ K+ 0 π- FIRST OBSERVATION of the DECAY B0 →d0 D ˉ K+ 0 π- AAIJ R. et al.

作者：Aaij R.; Beteta C.A.; Ackernley T.; Adeva B.; Adinolfi M.; Afsharnia H.; Aidala C.A.; Aiola S.; Ajaltouni Z.; Akar S.; Albrecht J.; Alessio F.; Alexander M.; Albero A.A.; Aliouche Z.; Alkhazov G.; Cartelle P.A.; Alves A.A.; Jr.; Amato S.; Amhis Y.; An L.; Anderlini L.; Andreassi G.; Andreianov A.; Andreotti M.; Archilli F.; Artamonov A.; Artuso M.; Arzymatov K.; Aslanides E.; Atzeni M.; Audurier B.; Bachmann S.; Bachmayer M.; Back J.J.; Baker S.; Rodriguez P.B.; Balagura V.; Baldini W.

来源：PHYSICAL REVIEW D, 2020, 102(5): 051102.

DOI：10.1103/PhysRevD.102.051102

The first observation of the decay B0→D0Dˉ0K+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→D0Dˉ0K+π- decays is thus determined to be B(B0→D0Dˉ0K+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.