First observation of B0 s→D*s2+Xμν̄- decays

The LHCb Collaboration

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)


Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0 s→D+ s+Xμν̄ and B0 s→D0K+Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ and Ds2*(2573)+ mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B0 s→Ds2*+Xμν̄)/B(B0 s→Xμν̄)=(3.3±1.0±0.4)%, and B(B0 s→D+ s1Xμν̄)/B(B0 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 B0 s decays; we also measure its mass and width.

Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalPhysics Letters B
Issue number1
Publication statusPublished - 28 Mar 2011
Externally publishedYes


  • B-s0 meson
  • LHC
  • Semileptonic b decays

Cite this