The first observation of the decay B s 0→K *0K̄ *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/c 2 of the B s 0 mass and 746 MeV/c 2<m Kπ<1046 MeV/c 2, mostly coming from a resonant B s 0→K *0K̄ *0 signal. The branching fraction and the CP-averaged K *0 longitudinal polarization fraction are measured to be B(B s 0→K *0K̄ *0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(f s/f d))×10 -5 and f L=0.31±0.12(stat.)±0.04(syst.).
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 13 Mar 2012|
Bibliographical noteFunding Information:
We would like to thank J. Matías for useful discussions. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at CERN and at the LHCb institutes, and acknowledge support from the National Agencies: National Agencies: CAPES , CNPq , FAPERJ and FINEP (Brazil); CERN ; NSFC (China); CNRS/IN2P3 (France); BMBF , DFG , HGF and MPG (Germany); SFI (Ireland); INFN (Italy); FOM and NWO (The Netherlands); SCSR (Poland); ANCS (Romania); MinES of Russia and Rosatom (Russia); MICINN , XuntaGal and GENCAT (Spain); SNSF and SER (Switzerland); NAS Ukraine (Ukraine); STFC (United Kingdom); NSF (USA). We also acknowledge the support received from the ERC under FP7 and the Region Auvergne .
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics