First observation of the decay Bs0→K*0*0

The LHCb Collaboration

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The first observation of the decay Bs0→K*0*0 is reported using 35 pb-1 of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8±7.5 Bs0→(K+π-)(K-π+) events are observed within ±50 MeV/c2 of the Bs0 mass and 746 MeV/c2<m<1046 MeV/c2, mostly coming from a resonant Bs0→K*0*0 signal. The branching fraction and the CP-averaged K*0 longitudinal polarization fraction are measured to be B(Bs0→K*0*0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(fs/fd))×10-5 and fL=0.31±0.12(stat.)±0.04(syst.).

Original languageEnglish
Pages (from-to)50-58
Number of pages9
JournalPhysics Letters B
Issue number1-2
Publication statusPublished - 13 Mar 2012
Externally publishedYes

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