Observation of B+c→D0K+ decays

Abstract : Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV, the B+c→D0K+ decay is observed with a statistical significance of 5.1 standard deviations. By normalising to B+→D¯0π+ decays, a measurement of the branching fraction multiplied by the production rates for B+c relative to B+ mesons in the LHCb acceptance is obtained, RD0K=fcfu×B(B+c→D0K+)=(9.3+2.8−2.5±0.6)×10−7, where the first uncertainty is statistical and the second is systematic. This decay is expected to proceed predominantly through weak annihilation and penguin amplitudes, and is the first B+c decay of this nature to be observed.
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Submitted on : Thursday, January 12, 2017 - 3:32:03 PM
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Observation of B+c→D0K+ decays. Physical Review Letters, American Physical Society, 2017, 118, pp.111803. ⟨10.1103/PhysRevLett.118.111803⟩. ⟨in2p3-01433293⟩

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