First observation of the Λb0→ D+DΛ decay

The Lhcb Collaboration

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The Λb0 → D+DΛ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.3 fb−1. Using the B0 → D+DKS0 decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be (Formula presented.) where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, BB0→D+DKS0, and the cross-section ratio, σΛb0/σB0, previously measured by LHCb are used to derive the branching fraction of the Λb0→ D+DΛ decay (Formula presented.) where the third and fourth contributions are due to uncertainties of BB0→D+DKS0 and σΛb0/σB0, respectively. Inspection of the D+Λ and D+D invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+DΛ decay is also observed for the first time as a partially reconstructed component in the D+DΛ invariant mass spectrum.

Original languageEnglish (US)
Article number140
JournalJournal of High Energy Physics
Volume2024
Issue number7
DOIs
StatePublished - Jul 2024

Keywords

  • B Physics
  • Branching fraction
  • Flavour Physics
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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