Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B 0 s→D + s+Xμν̄ and B 0 s→D 0K +Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known D s1(2536) + and D s2*(2573) + mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B 0 s→D s2*+Xμν̄)/B(B 0 s→Xμν̄)=(3.3±1.0±0.4)%, and B(B 0 s→D + s1Xμν̄)/B(B 0 s→Xμν̄)=(5.4±1.2±0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D* + s2 state in B 0 s decays; we also measure its mass and width.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 28 Mar 2011|
Bibliographical noteFunding Information:
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: 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 (Netherlands); SCSR (Poland); ANCS (Romania); MinES of Russia and Rosatom (Russia); MICINN , XUNGAL 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 Région Auvergne .
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics