Home > Research > Publications & Outputs > Measurement of the production fraction times br...

Electronic data

  • PhysRevD

    Rights statement: © 2011 American Physical Society

    Final published version, 205 KB, PDF document


Text available via DOI:

View graph of relations

Measurement of the production fraction times branching fraction f(b --> Λ_b)B(Λ_b --> J/ψΛ)

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number031102(R)
<mark>Journal publication date</mark>4/08/2011
<mark>Journal</mark>Physical Review D
Issue number3
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


The \Lambda_b(udb) baryon is observed in the decay \Lambda_b --> J/\psi \Lambda using 6.1 fb^{-1} of p\bar{p} collisions collected with the D0 detector at \sqrt{s}=1.96 TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B^0 --> J/\psi K^0_s is measured to be 0.345 \pm 0.034 (stat.) \pm 0.033 (syst.) \pm 0.003 (PDG). Using the world average value of f(b --> B^0)B(B^0 --> J/\psi K^0_s) = (1.74 \pm 0.08) \times 10^{-5}, we obtain f(b --> \Lambda_b)B(\Lambda_{b} --> J/\psi \Lambda) = (6.01 \pm 0.60 (stat.) \pm 0.58 (syst.) \pm 0.28 (PDG)) \times 10^{-5}. This measurement represents an improvement in precision by about a factor of three with respect to the current world average.

Bibliographic note

© 2011 American Physical Society Submitted to PRD-RC