Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S., Amato, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This paper reports the first observation of the decay B0 -> D0bar K+ K- and presents evidence for Bs -> D0bar K+ K- decays, measuring their relative branching fractions with statistical significance from LHCb data.
Contribution
It provides the first observation of B0 -> D0bar K+ K- decay and evidence for Bs -> D0bar K+ K- decay, including their relative branching fractions.
Findings
First observation of B0 -> D0bar K+ K- decay with 5.8 sigma significance.
Evidence for Bs -> D0bar K+ K- decay with 3.8 sigma significance.
Measured relative branching fractions for both decays.
Abstract
The first observation of the decay B0 -> D0bar K+ K- is reported from an analysis of 0.62 fb-1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B0 -> D0bar pi+ pi- to be BR(B0 -> D0bar K+ K-)/BR(B0 -> D0bar pi+ pi-) = 0.056+-0.011+-0.007, where the first uncertainty is statistical and the second is systematic. The significance of the signal is 5.8 sigma. Evidence, with 3.8 sigma significance, for Bs -> D0bar K+ K- decays is also presented, with a relative branching fraction of BR(Bs -> D0bar K+ K-)/BR(B0 -> D0bar K+ K-) = 0.90+-0.27+-0.20.
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